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Bota 0111: Genetics Question Paper

Bota 0111: Genetics

Course:Diploma In Animal Health And Production

Institution: Chuka University question papers

Exam Year:2013

CHUKA

UNIVERSITY

UNIVERSITY EXAMINATIONS
FIRST YEAR EXAMINATION FOR THE AWARD OF
DIPLOMA IN ANIMAL HEALTH AND PRODUCTION

BOTA 0111: GENETICS

STREAMS: DIP (ANHE) Y1S1 TIME: 2 HOURS

DAY/DATE: TUESDAY 6/8/2013 2.30 PM-4.30 PM
INSTRUCTIONS:

Answer all questions in Sections A and Any Two in Section B. Use illustrations where appropriate to enhance your answers.

1. (a) In your own words, explain the principle of independent segregation.
[1 mark]

(b) Explain briefly the advantage of using Pisum sativum in genetic experiments as Mendel did. [1 mark]

(c) Define the terms

(i) locus

(ii) homozygote

(iii) trihybrid cross

(v) hybrid

(vi) true-breeding line

(vi) testeross. [3 marks]

2. Write short notes on multiple alleles. [5 Marks]

3. (a) Enumerate the components of a nucleotide. [1 ½ marks]

(b) Study the diagram below and answer the questions that follow, to summarize the process of spermatogenesis.

k m n

(i) Name structures j and l [1 mark]

(ii) Name the processes k, m and n [1 ½ marks]

(c) Explain the distinguishing characteristics of a dominant allele. [1 mark]

4. Describe how sex-linked genes are passed by a woman to her offspring. [5 marks]

5. (a) Explain briefly how genes and their alleles are assigned symbols. [2 marks]

(b) A man and his wife are both heterozygous for the gene determining skin colour. Predict the proportion of their children that will be homozygous for the recessive allele. [3 marks]

6. Briefly explain how DNA and RNA differ in structure. [5 marks]

Section B

7. Giving examples, explain 3 commonly used methods of predicting genetic crosses. [20 marks]

8. Write an essay on lethal genes. [20 marks]

9. Explain the consequences of an Rh-negative mother giving birth to an Rh- positive baby and the corrective measures that need to be taken. [20 marks]

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Bota 0111: Genetics Question Paper

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