What base is responsible for hot spots for spontaneous pint mutations?

• Adenine

• Guanine

• 5-bromouracil

• 5-methyl cytosine

In peal plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow and green seeded plants could you expect in F₁-generation

• 9 : 1

• 1 : 3

• 3 : 1

• 50 : 50

In a mutational event, when adenine is replaced by guanine, it is a case of

• Frameshift mutation

• Transcription

• Transition

• Transversion

Match the following Column I with Column II.

Column I	Column II
A. Complementrary Ratio	1. 9:7
B. Supplementary Ratio	2. 9:3:4
C. Epistatic Ratio	3. 12:3:1
D. Inhibitory Ratio	4. 13:3

• A-4, B-1, C-3, D-2

• A-1, B-2, C-3, D-4

• A-4, B-1, C-2, D-3

• A-1, B-3, C-2, D-4

A woman with two genes (one on each X-chromosome) for haemophilia and one gene for colour blindness on the X-chromosome marries a normal man. How will the progeny be?

• All sons and daughters are haemophilic and colourblind

• Haemophilic and colourblind daughters

• 50% haemophilic colourblind sons and 50% haemophilic sons

• 50% haemophilic daughters and 50% colourblind daughters

A hereditary disease which is never passed on from father to son is

• X-chromosomal linked disease

• Autosomal linked disease

• Y chromosomal linked disease

• None of the above

A man of blood group- A marries a woman of blood group- AB, which type of progeny would indicate that man is heterozygous?

• O

• B

• A

• AB

In Pisum sativum, there are 14 chromosomes. How many types of homologous pairs can be prepared?

• 14

• 7

• 2¹⁴

• 2¹⁰

Pure tall plants are crossed with pure dwarf plants. In the F₁ generation, all plants were tall. These tall plants of F₁ generation were selfed and the ratio of tall to dwarf plants obtained was 3 : 1. This is called

• dominance

• inheritance

• codominance

• heredity

240.

Chromosome complement with 2n - 1 is called

• monosomy

• nullisomy

• trisomy

• tetrasomy