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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