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Sbt 104:Basis Of Genetics Question Paper

Sbt 104:Basis Of Genetics

Course:Bachelor Of Education (Science)

Institution: Kaimosi Friends University College question papers

Exam Year:2017

KAIMOSI FRIENDS UNIVERSITY COLLEGE
( A Constituent College of Masinde Muliro University of Science and Technology)

UNIVERSITY EXAMINATIONS
SEMESTER 2,2016/2017 ACADEMIC YEAR
MAIN EXAMINATION

FIRST YEAR SECOND SEMESTER EXAMINATION
FOR THE DEGREE OF BACHELOR OF EDUCATION (SCIENCE)

COURSE CODE: SBT 104
COURSE TITLE: BASIS OF GENETICS

DATE: Wednesday 26th July ,2017

TIME:2-4 PM

INSTRUCTIONS TO CANDIDATES

Answer Question ONE( COMPULSORY) and any other TWO questions.

KAFUCO Observes ZERO tolerance to examination cheating

QUESTION ONE

a) Give the role of each of the following organelles in a cell

iThe nucleus. 1 mark
ii. The ribosome. 1 mark
iii.Golgi apparatus 1 mark
iv.Lysosome 1 mark

b)i Write down the DNA complementary base pairing for a strand bearing the bases as shown.

A- G - T - C- C- G-A-T. 1 mark

ii.State three critical differences between RNA and DNA. 3 marks

c) Define the following terms as used in genetics. 4 marks

i.Gene
ii.Alleles.
iii.Heterozygous condition
iv.Dominant allele

d).i)State the Mendel's principle of segregation. 2 marks
ii.State two cases where genes do not conform to Mendel's rules. 2 marks

e) i.Explain the meaning of the term cancer. 2 marks
ii.Name two types of tumours. 2 marks

f). Explain the meaning of the following terms. 4 marks

i.Incomplete sex linkage
ii.Sex influenced dominance
iii.sex limited inheritance

iv.Holandric inheritance

g)i.What are multiple alleles? Give one example of multiple alleles in human 2 marks
ii.How many genotypes can be generated by genes with 5 alleles? 2 marks.

h)i.What is heritability 1 mark
ii.Explain the meaning of the following expressions in terms of heritability.

i.H=O. 1 mark
ii.H=1. 1 mark

i)State the contributions of the persons listed below to the history and development of genetics

i.Darwin and Wallace 2 marks
ii.Gregor Mendel. 1 mark
iii.Watson and Creek. 1 mark

j.Consider a population at Hardy- Weinberg equilibrium where the frequency of tallness (A-) is 0.96 and the frequency of shortness (aa) is 0.04

i. Calculate the allelic frequency of the recessive allele. 1 mark

ii.Calculate the allelic frequency of the other allele. 1 mark

iii.Calculate the genotypic frequencies using the allelic frequency obtained. 3 marks

QUESTION TWO.
.a). Describe the structure of DNA molecule. 10 marks

b) Explain the process of DNA replication. 5 marks

QUESTION THREE

a) Explain the stages of mitosis. 10 marks

b) Briefly explain the genetic code. 5 marks

QUESTION FOUR

Explain the process of protein synthesis. 15 marks

Sbt 104:Basis Of Genetics Question Paper

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