1.  chromosome 4, chromosome 7 and chromosome 11

2.  chromosome7, chromosome 12 and chromosome 11

4.  chromosome 11, chromosome 4 and chromosome 12

1.  childhood

2.  adolessemia

3.  young people

1.  O, A

3.  O, A, B

4.  O, A, B, AB

1.  sterile

2.  deed

3.  no reaction

1.  all the children will be normal

2.  half girls will be haemophilic

4.  all the girls will be haemophilic

2.  X-chromosome

3.  Both (a) and (b)

4.  None of these

1.  no production of haemogolobin in the blood

2.  no production of melanin in the skin

3.  a failure in the clotting mechanism of blood

1.  Y-linked genes

2.  X-linked genes

4.  Y-linked genes modification

1.  all offsprings are haemophilic

2.  all girls are haemophilic

4.   half daughters and half sons are haemophilic

1.  Osmosis

3.  Active transport

4.  Brownian movement