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Principles Of Genetics Question Paper

Principles Of Genetics

Course:Bachelor Of Science In Agriculture

Institution: University Of Nairobi question papers

Exam Year:2015

INSTRUCTION
ANSWER ALL QUESTIONS IN THE PAPER
1.In a family of seven children,what is the probability of obtaining the following number of boys and girls?
(a)All boys (4 marks)
(b)All children of the same sex (4 marks)
(c)Six girls and one boy (4 marks)
(d)Four boys and three girls) (4 marks)
(e)four girls and three boys (4 marks)
2.Whatare the functions of the following enzymes during the replication of DNA?
a)DNA polymerase I,II and III (4 marks)
b)DNA primase (4 marks)
c)DNA helicase (4 marks)
d)DNA gyrase (4 marks)
e)Exonuclease (4 marks)
3.The following genotypes are crossed:
Aa Bb Cc dd Ee X Aa bb Cc Dd Ee
What will be the proportion of the following genotypes among the progeny of this cross?
a)Aa Bb Cc Dd Ee (4 marks)
b)Aa bb Cc dd ee (4 marks)
c)aa bb cc dd ee (4 marks)
d)AA BB CC DD EE (4 marks)
e)AA bb CC dd EE (4 marks)
4.In the rosees,the red flower colour (R) is incompletely dominant over white flower (r).The heterozygotes produce pink flowers.A red flower rose plant was crossed with a plant with white flowers,and their F1 intercrossed to produce F2.
a)What were the genotype of the F1 and expected proportions? (8 marks)
b)If the F1 are backcrossed to the white plant,what will be the genotype and phenotypes of the offspring? (6 marks)
c)If the F1 are backcrossed to the red plant,what will be the genotypes and phenotypes of the offsprings? (6 marks)
5.a)Differenciate between meiosis and mitosis (5 marks)
b)Describe the process of meiosis in living organisms (15 marks)

Principles Of Genetics Question Paper

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