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Cell Biology And Genetics Question Paper

Cell Biology And Genetics

Course:Bachelor Of Education Science

Institution: Kenyatta University question papers

Exam Year:2008

KENYA TT A UNIVERSITY
UNIVERSITY EXAMINATIONS
2007/2008
INSTITUTE OF OPEN LEARNING
EXAMINATION
FOR THE DEGREE OF BACHELOR
OF
SCIENCEIBACHELOR
OF EDUCATION
SBT 300: CELL BIOLOGY AND GENETICS
DATE: MONDAY, 7TH JANUARY 2008
TIME:
10.30A.M. - 12.30 P.M.
INSTRUCTIONS:
Answer all questions in Section A in the spaces provided and TWO
questions in Section B in the answer book provided.
SECTION A - SHORT ANSWER QUESTIONS (5 MARKS EACH)
1.
Differentiate penetrance and expressivity of genes using polydactyly trait in human beings as an example.
2.
Define the following terms giving suitable examples using symbols A, a, B, b C, c and so on as required:
Alleles
Genotype
Locus
Phenotype
3.
Discuss the structure, functions and distribution of celllysosomes.
4.
Differentiate DNA from RNA genetic materials.
5.
What are maternal effects?

SECTION B: ESSAY AND ESSAY-TYPE QUESTIONS (40 MARKS)
Answer any two questions.
1.
What is the evidence that DNA is the primary genetic material?
2.
Describe the crosses Gregor Mendel made with Pisum sativum plant varieties to enable him propose the multi-particulate theory of inheritance.
3.
Describe the structure, distribution and functions of the cell mitochondria.