Among fraternal twins, one baby is haemophilic while the baby's brother is normal. Which statement is true:
1.  Baby is male
2.  Baby is female
3.  Mother is heterozygous
4.  Mother is homozygous

Minor change in a gene's structure is called:
1.  Reversible mutation
2.  Point mutation
3.  Forward mutation
4.  Backward mutation

According to Mendelism which character is showing dominance:

1. Terminal position of the flower

2. Green colour in the seed coat

3. Wrinkled seed

4. Green pod colour

Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered:

1. 50%

2. 75%

3. 25%

4. 100%

Which of the following is the correct match:

1. Down Syndrome = 21st Chromosome

2. Sickel cell anaemia = X – Chromosome

3. Haemophilia = Y – Chromosome

4. Parkinson Disease = X & Y Chromosomes

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