Bangalore University 2010-1st Sem B.Sc Genetics I /e - Question Paper

II Semester B.Sc. Examination,May/June 2010
(Semester Scheme)
GENETICS (Paper-II)
Mendelian Genetics and Biometry

Time: three Hours Max.Marks:60

PART - A

I. ans any 5 of the following: (5 x three = 15)

1) discuss briefly the theory of Germplasm.

2) Differentiate Genotype and Phenotype with suitable example.

3) Write the properties of a normal curve.

4) What is a test cross? discuss with an example.

5) describe Phenocopies. Illustrate with suitable example.

6) A man of blood group AB marries a woman of blood group B(Heterozygous).What will be blood group of their children?

7) discuss XX-XO kind of sex determination with an example.

PART - B

II. ans any 5 of the following: (5 x five = 25)

1) discuss incomplete dominance with an example.

2) provide reasons for the success of Mendel's experiments with pea plant.

3) With suitable example illustrate duplicate recessive gene interaction.

4) describe standard deviation. List any 2 merits and demerits of standard deviation.

5) elaborate multiple alleles? discuss with reference to the inheritance of eye colour in Drosophila.

6) 2 varieties of Snapdragons are with red flowers and other with white flowers were crossed.

The outcomes found in F2 generation are 22 Red, 52 Pink and 23 White flower plants. Ascertain

whether these figures show that segregation occurs in the ratio of 1:2:1 (Table value of Chi-square

at 5% level of significance is 5.99)

7) discuss the hormonal control of sex determination.

PART - C

III. ans any 2 of the following: (2 x 10 = 20)

1) discuss Bridges genic balance theory of sex determination in Drosophila.

2) describe Epistasis. discuss dominant epistasis with an example.

3)a) define the legal regulations of Independent Assortment.

b) IN guinea pigs rough coat 'R' is dominant over smooth coat 'r' and black coat colour 'B'

over white 'b'. obtain the phenotypic and genotypic ratio of the subsequent crosses:

i) RRBb x rrbb

ii) rrBB x rrbb

4) A husband and spouse appear in the interview for 2 vacancies in the identical post. The probability

of the husbands selection is 1/7 and the spouse is 1/5. What is the probability that?

i) Both of them will be opted

ii) Only 1 of them will be opted

iii)None of them will be opted

Earning:   Approval pending.