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Kap101: General Genetics Question Paper

Kap101: General Genetics

Course:Bachelor Of Science In Agribusiness Management

Institution: Kenyatta University question papers

Exam Year:2012

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2011/2012
SECOND SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE
IN ANIMAL PRODUCTION AND HEALTH MANAGEMENT
KAP 101: GENERAL GENETICS

DATE: MONDAY, 2ND APRIL 2012 TIME: 8.00 A.M. – 10.00 A.M.

INSTRUCTIONS: Answer Q1 and any other THREE questions.

1.
(a)
List five differences between meiosis and mitosis.

(5 marks)

(b)
Define homozygous, heterozygous, homozygote, heterozygote and monohybrid.

(5 marks)

(c)
Using illustration discuss spermiogenesis.

(5 marks)

(d)
Discuss Triple allelism in relation to the human blood groups.

(5 marks)

(e)
Dominant gene (C) in chicken is responsible for aberrant forms called

“creepers” that have short crooked legs that are of little economic value and

the homozygous genotype (CC) is lethal. Describe the phenotypic and

genotypic ratios when two creepers mate.

(5 marks)
2.
(a)
Discuss the cell cycle indicating when chromosomes are unipartite and bipartite.

(b)
Discuss the basis of cytoplasmic inheritance.

(5 marks)

(c)
Discuss pedigree analysis and crossing in human and plant genetics.
(5 marks)
3.
Briefly discuss oogenesis

(15 marks)
4.
In pigeons, the checkered pattern is dependent on a dominant gene C and a plain

exterior on the recessive c. Red colour is controlled by a dominant gene B and brown

by recessive allele b. Describe the phenotypic and genotypic ratios in F2 of a cross

between homozygous checkered red birds and plain brown birds using both Punnett

square and Forked-line methods.

(15 marks)
5.
In a population of 160,000 individuals that is in Hardy-Weinberg equilibrium,

78,400 and 14,400 individuals are homozygous for each allele respectively.

Calculate:

(i)
The number of heterozygotes.

(3 marks)

(ii)
The frequency of all genotypes.

(6 marks)

(iii)
The frequency of the alleles.

(6 marks)
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Kap101: General Genetics Question Paper

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