Question Paper

Course:Bachelor Of Education Science

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE AND BACHELOR OF EDUCATION

SBT 300:
CELL BIOLOGY AND GENETICS

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DATE: THURSDAY 24TH DECEMBER 2009 TIME: 8.00 A.M. – 10.00 A.M.

INSTRUCTIONS
Answer ALL Questions in Section A in the spaces provided in the Question paper,
and ONE question in Section B in the Answer Book provided.

SECTION A: SHORT ANSWER QUESTIONS (5 marks each, Total 40 marks)

1.
List evidence that DNA is the primary genetic material.

2.Distinguish penetrance from expressivity using the human polydactyly trait as a
specific
example.

3.Explain why people with blood type AB and O are considered universal receivers and

donors and yet their blood groups contain antigens and antibodies A and B

respectively, antigens and antibodies that cause agglutination when they mix.

4.List in order and distinguish various mitosis cell division stage.

5.Determine using a branching diagram gametes expected from a genotype AaBbCcDd

6.Giving examples explain the following terms:

a)
Test cross

b)Selfing

c)Pure or tube breeding

7.What are maternal effects?

8.What problems may arise if a Rhesus negative woman marries a Rhesus positive

man to have children?

SECTION B: Essay Questions (30 marks)

Write an essay of one of the following;

1.Sex determining mechanisms

2.Particulate theory of inheritance proposed by Gregor Mendel.

3.Using ABO blood groups to resolve paternity disputes.

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