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Zool 221: Animal Genetics And Evolution Question Paper

Zool 221: Animal Genetics And Evolution

Course:Bachelor Of Education Science

Institution: Kabarak University question papers

Exam Year:2013

KABARAK
UNIVERSITY

UNIVERSITY EXAMINATIONS
2012/2013 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR EDUCATION SCIENCE
(SBL)
ZOOL 221: ANIMAL GENETICS AND EVOLUTION
DAY: WEDNESDAY DATE: 27/11/2013
TIME: 2.00 – 4.00 P.M. STREAM: Y2S2
INSTRUCTIONS:
ANSWER ALL QUESTIONS IN SECTION A AND ANY TWO FROM SECTION B
SECTION A (40MARKS)
1.
Explain the meaning of the following terms

(8marks)
a) Segregation
b) Independent assortment
c) Epistasis
d) Polygenic character
2.
Let the amount of DNA in the nucleus of a cell at the beginning of interphase be x.
What will be the amount present at :-

(4marks)
a) The end of interphase
b) The end of mitosis
c) The end of first meiotic division
d) The end of second meiotic division
Give reasons for your answers

(4marks)
3.
a) Explain what fossils are

(2marks)

b) Describe the changes that took place in the evolution of the Horse from
Hyracotherium to Equus spp

(6marks)

4.
Three population of birds P, Q, and R live separately on three oceanic islands X, Y
and Z respectively. The birds all eat insects and nectar but have different beaks and
plumage. The islands are set throughout the year by strong prevailing winds in the
direction of X, Y and Z. Populations P and Q can interbreed and produce a fertile
offspring. Population Q can mate with population R but the young are sterile. Mating
does not occur at all between P and R. From your knowledge of the way evolution
works, explain how successful breeding occurs between P and Q but not between P
and R or Q and R

(8marks)
5.
In drosophila, black body colour is recessive to grey body colour. A geneticist had
three pairs of flies with grey bodies designated A, B and C. He crossed A x B and
obtained 109 grey bodied flies. A x C gave 80 grey bodied and 28 black bodied while
B x C gave 78 grey bodied flies. Explain, giving reasons the expected genotypic and
phenotypic ratios when the flies A, B and C are crossed with flies having black
bodies.

(8marks)

SECTION B (30MARKS)
6.
Describe the term “Adaptive Radiation” Illustrate your answer in reference to the
pentadactyl limb of vertebrates.

(15marks)
7.
a) Describe the causes of variations in animals

(8marks)
b) Discuss the role of variation in evolution

(7marks)

8.
Describe the biochemical defects that causes senescence in organisms
(15marks)

Zool 221: Animal Genetics And Evolution Question Paper

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