{"id":34481,"date":"2022-11-17T14:06:26","date_gmt":"2022-11-17T08:36:26","guid":{"rendered":"https:\/\/tsboardsolutions.com\/?p=34481"},"modified":"2022-11-18T10:49:20","modified_gmt":"2022-11-18T05:19:20","slug":"ts-inter-2nd-year-zoology-study-material-chapter-8","status":"publish","type":"post","link":"https:\/\/tsboardsolutions.com\/ts-inter-2nd-year-zoology-study-material-chapter-8\/","title":{"rendered":"TS Inter 2nd Year Zoology Study Material Chapter 8 Applied Biology"},"content":{"rendered":"
Telangana TSBIE\u00a0TS Inter 2nd Year Zoology Study Material<\/a> 8th Lesson Applied Biology Textbook Questions and Answers.<\/p>\n Very Short Answer Type Questions<\/span><\/p>\n Question 1. Question 2. Question 3. Question 4. Question 5. <\/p>\n Question 6. Question 7. Question 8. Question 9. Question 10. <\/p>\n Question 11. Question 12. Question 13. Question 14. Question 15. Question 16. Question 17. <\/p>\n Question 18. Question 19. Question 20. Question 21. Question 22. Question 23. Question 24. <\/p>\n Question 25. Short Answer type Questions<\/span><\/p>\n Question 1. 1) Inbreeding : Inbreeding is of two types : 2) Outbreeding : 1. Out-crossing : 2. Cross-breeding : 3. Interspecific hybridisation : Question 2. <\/p>\n Question 3. Animal husbandry is the agricultural practice of breeding and raising livestock (all domesticated animals reared for the benefit of man). It includes buffaloes, cows, pigs, horses, cattle, sheep, camels, goats etc. However the term livestock is often used for farm animals. If extended, it also includes poultry farming and fisheries.<\/p>\n Even though the estimated world’s livestock population in India and China together is more than 70%, their contribution to world’s farm produce is only 25%, i.e., the productivity per unit is very low. The average annual milk yield is about 170 liters per cow in India. Contrary to it, the average annual milk yield is about 4,100 liters per cow in Netherlands.<\/p>\n Because of its low productivity the Indian cow is known as ‘teacup cow’. So, newer technologies have to be applied to achieve improvement in quality and productivity. Modern methods of breeding, MOET (multiple ovulation and embryo transfer) and production of transgenic animals must be taken up on a large scale in addition to conventional practices and care.<\/p>\n Question 4. Now the genetic mother is ready for another round of super ovulation.<\/p>\n Question 5. Artificial insemination (Al) is the technique in which semen is collected from superior bulls and introduced into the famale reproductive tract when the female is in ‘heat’. This semen can be used immediately or can be frozen and used at a later period. It can be transported in a forzen form to the place where a female is housed. In this way desirable crosses can be made. The major advantage of Al over natural mating is that it permits the dairy farmer to use top proven sires (males) for genetic improvement of his herd and control of venereal diseases. Al is also tremendous value in making optimal use of different sires and enables dairy farmer to breed individual cows to selected sires according to their breeding goals.<\/p>\n The breeding centre at SALON in Rae Bareli is at present the breeder and producer of top quality frozen semen of pure exotic breeds.<\/p>\n Multiple Ovulation and Embryo Transfer (MOET) : Now the genetic mother is ready for another round of super ovulation.<\/p>\n Question 6. 2) Feed management (proper feed and water) : 3) Health care : 4) In addition to the above, hygiene, proper and safe farm conditions ensure better produce.<\/p>\n <\/p>\n Question 7. Mode of infection : Infection may be spread simply by touching contaminated surfaces. Birds infected by this type of influenza, continue to release the virus as in their faeces and saliva for as long as 10 days.<\/p>\n Symptoms : Prevention:<\/p>\n Question 8. Question 9. Question 10. <\/p>\n Question 11. 2. By-products: Fisheries have carved a niche in the Indian economy. We now talk about ‘Blue Revolution’ as being implemented on lines similar to ‘Green Revolution’.<\/p>\n In addition to pisciculture, the culture of prawns, crabs and pear! oysters enable us earn foreign exchange worth millions of dollars from their exports.<\/p>\n Question 12. The main challenge for the production of insulin in the laboratory using rDNA technique was getting insulin assembled into its mature form.<\/p>\n Question 13. A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains the disease causing microorganism and is often made from weakened of killed forms of the microbe. The toxins or one of the surface proteins of the microorganisms are also used in preparing vaccines.<\/p>\n The following are some important Biotechnologically produced vaccines. 2. Inactivated Whole Agent Vaccines : 3. Toxoids : Thus, vaccines are used in the prevention of diseases as they induce artificially acquired active immunity.<\/p>\n Question 14. Types of Gene Therapy : Germ line gene therapy : Somatic line therapy : Somatic line therapy can be either ex-vivo or in vivo. In ex-vivo, cells are modified outside the body and then transplanted back. In in-vivo, genes are changed in cells, while they are still inside the body.<\/p>\n Question 15. <\/p>\n Question 16. Question 17. MRI scanner and procedure : Question 18. P wave : QRS complex of ‘waves’: T wave is a positive wave. It represents the ventricular repolarisation. Its duration is 0.2 sec.<\/p>\n Intervals:<\/p>\n Question 19. Protocol:<\/p>\n <\/p>\n Question 20. The intensity and pattern of electrical activity depends on wakefulness, sleep, coma, certain pathological and phychological conditions. The main diagnostic application of EEG in neurological studies is the diagnosis of epilepsy (seizures). EEG shows distinct abnormal pattern in the case of epilepsy. EEG is also useful in the diagnosis of ‘coma’ and ‘brain death’. EEG studies are useful in analyzing sleep disorders (such as insomnia).<\/p>\n Waves of EEG : Long Answer Type Questions<\/span><\/p>\n Question 1. 1. Out-crossing : 2. Cross-breeding : 3. Interspecific hybridisation : <\/p>\n Question 2. Clinical Inferences from ECG :<\/p>\n Telangana TSBIE\u00a0TS Inter 2nd Year Zoology Study Material 8th Lesson Applied Biology Textbook Questions and Answers. TS Inter 2nd Year Zoology Study Material 8th Lesson Applied Biology Very Short Answer Type Questions Question 1. What factors constitute dairying? Answer: Breeding, feeding and management of milch animals, production, processing and marketing of their milk and milk … Read more<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[26],"tags":[],"yoast_head":"\nTS Inter 2nd Year Zoology Study Material 8th Lesson Applied Biology<\/h2>\n
\nWhat factors constitute dairying?
\nAnswer:
\nBreeding, feeding and management of milch animals, production, processing and marketing of their milk and milk products on economic basis constitute dairying.<\/p>\n
\nMention any two advantages of inbreeding.
\nAnswer:
\nTwo advantages of inbreeding :<\/p>\n\n
\nDistinguish betwen out-cross and cross-breed.
\nAnswer:
\nOutcrossing is the crossing of unrelated pure breeding animals of different traits with in the same breed whereas cross-breeding is the mating of animals of different breeds.<\/p>\n
\nDefine the terms layer and broiler. [Mar. ’17,’15 (A.P.)]
\nAnswer:<\/p>\n\n
\nWhat is apiculture? [Mar. ’20, 17, May 17 (A.P); Mar. ’15 (T.S); Mar. ’14]
\nAnswer:
\nApiculture or Beekeeping is the maintenance of hives of honey bees for the production of honey and wax. Beekeeping is an age old cottage industry.<\/p>\n
\nDistinguish between a drone and worker in a honey bee colony.
\nAnswer:<\/p>\n\n
\nDefine the term Fishery.
\nAnswer:
\nExploitation of fish and other related aquatic organisms is called Fishery.<\/p>\n
\nDifferentiate aquaculture and pisciculture.
\nAnswer:<\/p>\n\n
\nExplain the term hypophysation. [March 2015 (T.S.)]
\nAnswer:
\nHypophysation or induced breeding is followed in artificial breeding. Pituitary extracts containing FSH and LH or ovaprim are injected into brood fish to induce release of spawn for seed production.<\/p>\n
\nList out any two Indian carps and two exotic carps. [March 2018 (A.P.); May \/ June 2014]
\nAnswer:<\/p>\n\n
\nMention any four fish by-products. [March 2019]
\nAnswer:
\nFour fish by products are<\/p>\n\n
\n(prevent cancer cel! growth, lowers blood cholesterol)<\/li>\n
\nHow many amino acids and polypeptide chains are present in insulin? [March 2019]
\nAnswer:
\nHuman insulin is made up of 51 aminoacids arranged in two polypeptide chains chain A (21 amino adds) and chian B (30 – amino acids).<\/p>\n
\nDefine the term \u2019vaccine’.
\nAnswer:
\nThe term vaccine was coined by Edward Jenner. A vaccine is a biological preparation that improves immunity to a particular disease.<\/p>\n
\nMention any two features of PCR.
\nAnswer:<\/p>\n\n
\nWhat does ADA stand for? Deficiency of ADA causes which disease?
\nAnswer:
\nADA stands for Adenosine De Aminase. ADA deficiency causes severe combined immune deficiency (SCID). It is caused by the deletion or dysfunction of the gene encoding for the enzyme ADA.<\/p>\n
\nDefine the term transgenic animal.
\nAnswer:
\nAnimals that have their own geneome and had their DNA manipulated to possess and express an extra gene are known as transgenic animals.<\/p>\n
\nWhat is popularly called ‘Guardian Angel of Cell’s Genome’? [March 2020]
\nAnswer:
\nThe protein p53 plays an important role with reference to the G1 check point in the regulation of cell division cycle. It guards the integrity of the DNA. Hence it is often called the Guardian Angel of Cell’s Genome.<\/p>\n
\nList out any four features of cancer cells. [May 2007 (A.P.)]
\nAnswer:
\nCharacters of cancer cells :<\/p>\n\n
\nHow do we obtain radiographs?
\nAnswer:
\nA beam of X-rays is produced by an X-ray generator and is projected on the body parts. X-rays that pass through the body parts are recorded on a photographic film or observed on a fluorescent screen. Photographs developed using X-rays are known as radiographs or skiagraphs.<\/p>\n
\nWhat is tomogram?
\nAnswer:
\nThe X-ray detector of the CT-scanner can see hundreds of different levels of density and tissues in a solid organ. The data is transmitted to a computer which builds up 3-D cross sectional picture of the part of the body and displays the picture on the screen. This recorded image is called tomogram.<\/p>\n
\nMRI scan in harmless-justify. [March 2018 (A.P.); May\/June 2014]
\nAnswer:
\nMRI (Magnetic Resonance Imaging) scan is harmless because MRI does not use ionizing radiation as involved in X-rays and is generally a very safe procedure.<\/p>\n
\nWhat is electrocardiography and what are the normal components of ECG? [March 2015 (A.P.)]
\nAnswer:
\nElectrocardiography (ECG) is a commonly used, non invasive procedure for recording electrical changes in the heart.
\nA normal ECG consists 1) Waves 2) Intervals 3) Segments and 4) Complexes.<\/p>\n
\nWhat does prolonged P-R interval indicate?
\nAnswer:
\nProlonged P-R interval indicates delay in conduction of impulses from S-A node to the A-V node. P-R interval is prolonged in bradycardia (slow beating of heart) and shortened in tachycardia (fast beating of heart).<\/p>\n
\nDifferentiate between primary and secondary antibodies.
\nAnswer:<\/p>\n\n
\nWhich substances in a sample are detected by direct and indirect ELISA respectively? [March 2014]
\nAnswer:
\nDirect ELISA – ELISA used to detect antigens.
\nIndirect ELISA – ELISA done to detect antibodies.<\/p>\n
\nWhat are the various methods employed in animal breeding to improve livestock?
\nAnswer:
\nMethods of animal breeding : There are broadly two methods of breeding :<\/p>\n\n
\nWhen crossing is done between animals of the same breed it is called inbreeding. It refers to mating of more closely related individuals within the same breed of individuals in a lineage. The breeding strategy is the identification and mating of superior males and superior females of the same breed.<\/p>\n
\n1) Close breeding,
\n2) Line breeding.,
\nClose breeding is mating between male parent (sire) and female offspring and \/ or female (dam) with male offspring. Line breeding (cousin mating) is the selective breeding of animals for a desired feature by mating them within a closely related line (but not as close as close breeding). It leads to upgrading (to improve the quality of livestock by selective breeding for desired characteristics) of a desired commerical character.<\/p>\n
\nOut-breeding is the breeding of the unrelated animals; it is the cross between different breeds. Out-breeding is of three types<\/p>\n\n
\nIt is the practice of mating of animals within the same breed, but having no common ancestors on either side of the pedigree for 4-6 generations. The offspring of such a mating is known as an out-cross. It is the best breeding method for animals that are below average in milk production, growth rate (in beef cattle) etc. At times a single out-cross often helps to overcome inbreeding depression.<\/p>\n
\nIn this method, superior males of one breed are mated with superior females of another breed. The offspring of such a mating is said to be a cross-breed. Cross-breeding allows the desirable qualities of two different breeds to be combined. The progeny (cross breeds) are not only used for commercial production but also inbreeding and selection to develop stable breeds which may be superior to existing breeds.<\/p>\n
\nIn this method, male and female animals of two different related species are mated. The progeny may combine desirable features of both the parents and is different from both the parents. For example when a male donkey (jack \/ ass) is crossed with a female horse (mare), it leads to the production of a mule.<\/p>\n
\nDefine the term ‘breed’. What are the objectives of animal breeding?
\nAnswer:
\nAnimal Breeding :
\nAnimal breeding is an important aspect of animal husbandry which aims at increasing the yield of animals and improving the desirable qualities of the produce. A breed is a group of animals related by descent and similar in most characters like appearance, features, size, configuration, etc. The following are the desirable qualities for which we breed animals :<\/p>\n\n
\nExplain the role of animal husbandry in human welfare.
\nAnswer:
\nAnimal Husbandry :
\nThe strategies adopted for enhancing food production are bound to play a major role in meeting the requirement of food for the ever increasing world’s population in the near future. The biological principles that are applied to animal husbandry will become crucial in our efforts to increase the food production.<\/p>\n
\nList out the various steps involved in MOET.
\nAnswer:
\nMultiple Ovulation and Embryo Transfer (MOET) :
\nThe following are the steps invovled in MOET.<\/p>\n\n
\nWrite short notes on controlled breeding experiments.
\nAnswer:
\nControlled Breeding Experiments :
\nThey are carried out using artificial insemination and multiple ovulation and embryo transfer technology (MOET).<\/p>\n
\nThe following are the steps invovled in MOET.<\/p>\n\n
\nExplain the important components of poultry management.
\nAnswer:
\nImportant Components of Poultry Management:
\n1) Selection of disease free and suitable breeds :
\nThe selected breed should get acclimatised to a wide range of climatic conditions. Hybrid layers used in India are BV-300, Hyline, Poona pearls, etc. Commercial broiler strains used in India include Hubbard, Vencobb, etc.<\/p>\n
\nBalanced diet is a must to maximise the yield. Brooder \/ chick mash, grower mash, prelayer mash and layer mash are fed to layers at different ages. Likewise pre starter mash, starter mash and finish mash are the feed given to broilers. ‘Safe water’ should be supplied through waterers at all times.<\/p>\n
\nVaccination against viral diseases (Ranikhet, Marek’s, and Gumboro) and using antibiotics to treat bacterial diseases {Fowl cholera, Infectious coryza, Chronic Respiratory Disease (CRD)} make the poultry birds disease free. Fungal diseases affecting poultry are Brooder’s pneumonia. Aflatoxicosis and Thrush.<\/p>\n
\nDiscuss in brief about ‘Avian Flu’. [March 2020]
\nAnswer:
\nAVIAN FLU (BIRD FLU) is an important disease affecting poultry birds and man has to be very watchful about this disease as it is very dangerous to him too. Causative organism : Bird flu is caused by an ‘avian flu virus’, the H5N1. The virus that causes the bird infection infects human too. It can start a worldwide epidemic (Pandemic disease).<\/p>\n
\nInfection by the avian influenza virus H5N1 in humans causes typical flu-like symptoms, which might include : cough (dry or with phlegm), diarrhoea, difficulty in breathing, fever, headache, malaise, muscle aches and sore throat.<\/p>\n\n
\nExplain in brief about queen bee. [May\/June 2014]
\nAnswer:
\nQUEEN :
\nIt is the individual in the colony; It is a fertile, diploid female, one per bee hive and the egg layer of the colony. She lives for about five years and her only function is to lay eggs. The queen bee during its nuptial flight receives sperms from a drone and stores in the spermatecae and lays two types of eggs, the fertilised and unfertilised. All fertilised eggs develop into females. All the larvae developing from the fertilised eggs are fed with the royal jelly (vitamin and nutrient rich secretion from the glands in the hypopharynx of the nurse workers) for the first 4 days only. Afterwards royal jelly is fed only to the bee that is bound to develop into next queen, whereas the other larvae fed on bee bread (honey and pollen) become workers (sterile females).<\/p>\n
\nHoney bees are economically important-justify.
\nAnswer:
\nEconomic importance of Honey bees; The bee products like Honey, wax, propolis and bee venom are used in various ways.<\/p>\n\n
\nWhat are the various factors required for bee keeping?
\nAnswer:
\nFactors \/ requirements for successful Beekeeping :<\/p>\n\n
\nFisheries have carved a niche in Indian economy-explain.
\nAnswer:
\nEconomic Importance of Fishery :
\n1. As Food :
\nFish meat, in general, is a good source of proteins, vitamins (A and D), minerals and rich in iodine. Tunas, shrimps and crabs are not only edible but have export value also.<\/p>\n
\nA) Shark and cod liver oils are good sources of vitamins A and D. Oil from Sardine and Salmon are good sources of omega 3 fatty acids, which have multiple functions (reduce cholesterol, help prevent cancer cell growth etc.)
\nB) Fish guano : Fertilizer prepared from ‘scrap fish’.
\nC) Other fish by-products are shagreen, Isinglass (substance obtained from dried swim bladders of mostly cat fish, used in clarification of wines) etc.<\/p>\n
\nExplain in brief structure of Insulin. [March 2015 (A.P.)]
\nAnswer:
\n
\nStructure of insulin :
\nHuman insulin is made up of 51 amino acids arranged in two polypeptide chains – chain A (21 amino acids) and chain B (30 amino acids), which are linked together by disulphide linkages. In mammals, including humans, insulin is synthesised as a prohormone (like a pro-enzyme, which needs to be processed before it becomes fully mature and functional hormone) which contains an extra stretch called the c peptide. This c peptide is not present in the mature insulin and is removed during maturation into insulin.<\/p>\n
\nDefine vaccine and discuss about types of vaccines.
\nAnswer:
\nVaccines :
\nThe term ‘vaccine’ was coined by Edward Jenner. He immunised a boy against small pox by inoculating him with a relatively less dangerous cow pox virus. The technique of attenuating or weakening of a microbe was developed by Pasteur.<\/p>\n
\n1. Attenuated Whole Agent Vaccines :
\nThey contain disabled (made iess virulent) live microorganisms. Mostly they are antiviral. Examples: Vaccines against yellow fever, measles, rubella, and mumps and the bacterial disease such as typhoid.<\/p>\n
\nThey contain “killed microbes’ (virulent before killing). Examples : Vaccines against influenza, cholera, bubonic plague, polio, hepatitis A, rabies and Sabin’s oral polio vaccine.<\/p>\n
\nThey contain ‘toxoids’ which are inactivated ‘exotoxins’ of certain microbes. Examples : The vaccines against Diphtheria and Tetanus.<\/p>\n
\nWrite in brief the types of gene therapy.
\nAnswer:
\nGene therapy is the insertion of genes into an individual’s cells and tissues to treat a disease such as a heriditary disease in which a deleterious mutant allele is replaced with a functional one.<\/p>\n
\nTwo basic types of gene therapy can be applied to humans, germ line and somatic line.<\/p>\n
\nIn this type of therapy, functional genes (normal genes) are introduced into sperms or ova and are thus integrated into their genomes. Therefore the change or modification becomes heritable. Due to various technical and ethical reasons, the germ line gene therapy remained at the ‘infant stage’ for the time being.<\/p>\n
\nIn this type of therapy, functional genes are introduced into somatic cells of a patient. The approach is to correct a disease phenotype by treating some somatic cells in the affected person. The changes effected in this type of GT are non-heritable.<\/p>\n
\nList out any four salient features of cancer cells.
\nAnswer:
\nSalient features of Cancer cells :<\/p>\n\n
\nExplain the different types of cancers. [Mar. ’18(A.P.); Mar. ’15 (T.S.); Mar. ’14]
\nAnswer:
\nTypes of cancers :
\nThere are different types of cancers such as carcinomas (cancers of epithelial tissues \/ cells which are most common as epithelial cells divide more often), sarcomas (cancers of connective tissues), leukemias (cancers of bone marrow cells resulting in understrained production of WBC – a liquid tumor), lymphomas (cancers of the lymphatic system). Certain types of cancers are called ‘familial cancers’ (cancer that occurs in families; genetic based) and others ‘sporadic cancers’ (non-hereditary cancers occurring without any family history). Some types of cancers are caused by ‘tumor forming RNA viruses’ (oncoviruses), e.g. Rous sarcoma virus which causes ‘avian sarcoma’.<\/p>\n
\nWrite about the procedure involved in MRI. [Mar. 2017, May ’17 (A.P.)]
\nAnswer:
\nMRI scan (Magnetic Resonance Imaging) is a diagnostic Radiology Technique. MRI is a non invasive medical imaging technique that helps physicians diagnose certain anatomical abnormalities or pathological conditions.<\/p>\n
\nMRI scanner is a giant circular magnetic tube. The patient is placed on a movable bed that is inserted into the magnet. Human body is mainly composed of water molecules which contain two hydrogen nuclei \/protons, each. The magnet creates a strong ‘magnetic field’ that makes these protons align with the direction of the magnetic field (protons are not aligned under normal conditions). A second radiofrequency electromagnetic field is then turned on for a ‘brief period’. The ‘protons’ absorb some energy from these ‘radio waves’. When this ‘second radio frequency emitting field’ is turned off, the protons release energy at a radiofrequency which can be detected by the MRI scanner (the protons return to their ‘equilibrium state’ from the ‘energized state’ at different ‘relaxation’ rates).<\/p>\n
\nWrite briefly about different waves and intervals in an ECG. [March 2019]
\nAnswer:
\nWaves :
\nThe waves in a normal record are named: P, Q, R, S, and T, in that order. A typical ECG tracing of a normal heartbeat (or cardiac cycle) consists of I. a ‘P’ wave, II. a ‘QRS complex’ of ‘waves’, III. a T wave.<\/p>\n
\nIt represents the ‘atrial depolarization or atrial systole’. P wave shows that the impulse is passing through the atria. The normal duration of a P wave is -0.1 sec.<\/p>\n
\n(Ventricular depolarization \/ ventricular systole) i) Q wave is a small negative wave, ii) R wave is a tall positive wave, iii) S wave is a negative wave. The normal duration of QRS complex of waves is about 0.08 – 0.1 sec.<\/p>\n\n
\nDiscuss briefly the process of indirect ELISA.
\nAnswer:
\nIndirect ELISA :
\nIt is used to detect antibodies. The blood of the person undergoing the ‘assay’ (for example the HIV test) is allowed to clot and the cells are centrifuged out to obtain the clear serum with antibodies (called primary antibodies).<\/p>\n\n
\nWrite short note on EEG.
\nAnswer:
\nEEG :
\nElectroencephalography is the process of recording the electrical activity of the brain (graphical recording called electroencephalogram) with the help of an EEG machine and some ‘electrodes’ placed all over the scalp. Electro\u00acencephalograph is a very useful tool in diagnosing neurological and sleep disorders. The changed EEG patterns in the case of ‘epilepsy’ are conveniently studied with the help of an EEG. Brain shows continuous electrical activity of innumerable neurons.<\/p>\n
\nThe waves recorded by an EEG consist of<\/p>\n\n
\nWrite in detail about out breeding.
\nAnswer:
\nOut breeding :
\nOut-breeding is the breeding of the unrelated animals; it is the cross between different breeds. Out-breeding is of three types<\/p>\n\n
\nIt is the practice of mating of animals within the same breed, but having no common ancestors on either side of the pedigree for 4-6 generations. The offspring of such a matting is known as an out-cross. It is the best breeding method for animals that are below average in milk production, growth rate (in beef cattle) etc. At times a single out-cross often helps to overcome inbreeding depression.<\/p>\n
\nIn this method, superior males of one breed are mated with superior females of another breed. The offspring of such a mating is said to be a cross-breed. Cross-breeding allows the desirable qualities of two different breeds to be combined. The progeny (cross breeds) are not only used for commercial production but also inbreeding and selection to develoop stable breeds which may be superior to existing breeds. For example, Hisardale is a new breed of sheep developed in Punjab by crossing ‘Bikaneri ewes’ and ‘Marino rams’.<\/p>\n
\nIn this method, male and female animals of two different related species are mated. The progeny may combine desirable features of both the parents and is different from both the parents. For example when a male donkey (jack \/ ass) is crossed with a female horse (mare), it leads to the production of a mule (sterile). Similarly when a male horse (stallion) is crossed with a female donkey (jennet), hinny (sterile) is produced. Mules have considerable economic value.
\nJack \/ ass X mare = mule; Stallion X Jenne thinny.<\/p>\n
\nExplain in detail clinical inferences from ECG.
\nAnswer:
\nECG may mean electrocardiogram \/ electrocardiograph, but most commonly used for electrocardiogram. Electrocardiography is a commonly used, non-invasive procedure for recording electrical changes in the heart. The graphic record, which is called an electrocardiogram (ECG or EKG), shows the series of waves that relate to the electrical impulses which occur during each cardiac cycle. An electrocardiograph is a device which records the electrical activity of the heart muscle (depolarisations and repolarisations).<\/p>\n
\nWhat is electrocardiography?
\nElectrocardiography is the technique by which the electrical activities of the heart are studied. Sensors (electrodes) are placed at specific parts of the body and linked to the ECG machine. ECG is recorded using 12 ‘LEADS’ (sensors from limbs and chest). Obtaining an electrocardiogram typically takes a few minutes, after which the electrodes are removed.<\/p>\n\n