What ratio is expected in offsprings if father is colour blind and mother's father was colour blind:
1.  50% daughter – colour blind
2.  All the sons are colour blind
3.  All the daughters colour blind
4.  All the sons are normal

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

Christmas disease is another name for:

1. Haemophilia B

2. Hepatitis B

3. Down's syndrome

4. Sleeping sickness

A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperm will be ABH?

Which of the following is not a hereditary disease:

1. Haemophilia

2. Cretinism

3. Cystic fibrosis

4. Thalasasemia