Column A --------------------------Column B

I. Gregor Mendel -------------A. Chromosomal theory of Inheritance

II. Sutton and Boveri -------------B. Law of Inheritance

III.Henking ----------------------C. Mendelian disorder

IV. Thalassemia -----------------D. Discovered x-body

The correct match is –

• I – B, II – A, III – D, IV – C

• I – D, II – A, III – B, IV – C

• I – D, II – B, III – A, IV – C

• I – B, II – C, III – D, IV – A

Bateson used the terms coupling and repulsion for linkage and crossing over. Name the correct parental or coupling type along with its cross over or repulsion:

• Coupling aaBB, aabb; Repulsion AABB, aabb

• Coupling AABB, aabb; Repulsion AABB, AAbb

• Coupling AAbb, aaBB; Repulsion AaBb, aabb

• Coupling AABB, aabb; Repulsion AAbb, aaBB

Which of the following is suitable for experiments on linkage?

• AABB x aabb

• AaBb x AaBb

• aaBB x aaBB

• AAbb x AaBB

The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were

• 1

• 2

• 3

• 4

F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of :

• Co-dominance

• Dihybrid cross

• Monohybrid cross with complete dominance

• Monohybrid cross with incomplete dominance

What is the ratio of one pair of contrasting character in F2 of a dihybrid ratio.

• 3 : 1

• 9 : 3 : 3 : 1

• 5 : 3

• 1 : 2 : 2 : 4 : 1 : 2 : 1 : 2 : 1

Theoretically, the modified allele could be responsible for the production of

I. the normal / less efficient enzyme

II. a non-functional enzyme

III. no enzyme at all

• I and II are correct

• I and III are correct

• I, II and III are correct

• II and III are correct

What map unit (Centimorgan) is adopted in the construction of genetic maps?

• A unit of distance between two expressed genes representing 10% cross over.

• A unit of distance between two expressed genes representing 100% cross over.

• A unit of distance between genes on chromosomes, representing 1% cross over.

• A unit of distance between genes on chromosomes, representing 50% cross over.

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation pink flowers were obtained. When pink flowers were selfed, the F2 generation showed white, red and pink flowers. Choose the incorrect statement from the following :

• This experiment does not follow the Principle of Dominance.

• Pink colour in F1 is due to incomplete dominance.

• Ratio of F2 is 1/4 (Red) : 2/4 (Pink) : 1/4 (White)

• Law of Segregation does not apply in this experiment

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :

• T.H. Morgan

• Gregor J. Mendel

• Alfred Sturtevant

• Sutton Boveri