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Kap 201: Quantitative Genetics And Animal Breeding Question Paper

Kap 201: Quantitative Genetics And Animal Breeding

Course:Bachelor Of Science In Animal Resource Management

Institution: Kenyatta University question papers

Exam Year:2011

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2011/2012
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN ANIMAL RESOURCE MANAGEMENT
KAP 201:QUANTITATIVE GENETICS AND ANIMAL BREEDING
DATE: MONDAY, 5TH DECEMBER 2011. TIME: 8.00A.M- 10.00 A.M.
INSTRUCTIONS: Answer question one and any other Three questions.
1. a) (i) What are the main characteristics of qualitative and quantitative traits? (4 marks)
( ii) Distinguish between ''Phenotype '' and ''genotype''. (4marks)
(iii) What do you understand by the term ''genetic and environmental interaction''? (2 marks)
(iv) Briefly explain the role of maternal effects on the performance of offspring? (2 marks)
b) i) What is grading up in animal breeding? (2 marks)
ii) State three advantages of grading up. (3 marks)
iii) Explain why grading up will not necessarily lead to improved production under certain circumstances. (5 marks)
iv)Discuss the factors that determine the right proportion of the local and exotic breed in a crossbreeding scheme. (5 marks)
2. a) i) What do you understand by the term repeatability? (2 marks)
ii) Explain the usefulness of repeatability concept in animal breeding. (5 marks)
b). i) What is the main disadvantage of taking repeated measurements on the animals over time. (2 marks)
ii) What are the alternative options to taking repeated measurements over time? (4 marks)
3. a). i) What is the meaning of the term variation as used in quantitative genetics. (3 marks)
ii) Distinguish between additive genetic variation and non-additive genetic variation. (2 marks)
iii) Explain the importance of non-genetic variation in animal breeding. (3marks)
b). i) What do you understand by the term heritability? (2 marks)
ii) Given the heritability of milk production in goats = 0.38 and that of litter weight at birth =0.06. Indicate which of the two traits likely to respond better to selection and why. ( 5 marks)
4. a). What is a random mating population? (3 marks)
b) Outline factors that can cause changes in gene and genotypes frequencies in a population. (6 marks)
c) Explain why is the number of animals of mating population is important. (6 marks)
5. a). i) Distinguish between the following terms: Phenotypic correlation and Genetic correlation. (3 marks)
ii) Why is it important to understand the concept of correlation of traits in animal breeding. (3 marks)
b) Explain how you would carry out rotational crossing using three breeds. (4 marks)
c) Briefly explain how the progress of crossbreeding scheme monitored? (5 marks)

Kap 201: Quantitative Genetics And Animal Breeding Question Paper

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