Irregularity is found in drosophila during organ differentiation for example- in place of the wing, long legs are formed. Which gene is responsible for it:

1. Double dominant gene

2. Homeotic gene

3. Complimentary gene

4. Plastid

Change in the sequence of nucleotides in DNA is called:

1. Mutagen

2. Mutation

3. Recombination

4. Translation

Which statement is correct:
 

Which of the following is the example of a sex-linked disease:

1. AIDS

2. Colour blindness

3. Syphilis

4. Gonorrhoea

Which of the following is the example of a pleiotropic gene:

1. Haemophilia

2. Thalassemea

3. Sickle cell anaemia

4. Colour blindness

A gene is said to be dominant if:

A plant of F₁-generation with genotype "AABbCC". On selfing of this plant what is the phenotypic ratio in F₂-generation:

1. 3 : 1

2. 1 : 1

3. 9 : 3 : 3 : 1

4. 27 : 9 : 9 : 9 : 3 : 3 : 3 : 1

A diseased man marries a normal woman. They get three daughters and five sons. All the daughters were diseased and the sons were normal. The gene of this disease is:

1. Sex-linked dominant

2. Sex-linked recessive

3. Sex-limited character

4. Autosomal dominant

There are three genes a, b, and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of genes on a chromosome?
1. b, a, c
2. a, b, c
3. a, c, b
4. None

Mangolian idiots are due to trisomy in the 21^st chromosome is called:

1. Down's syndrome

2. Turner's syndrome

3. Kleinfelters syndrome

4. Triplex syndrome