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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