Question

From which parent do sons inherit their blood-clotting gene?

Answer 1

A son inherits important blood clotting genes placed on X chromosome only from mother.

Explanation:

Chromosomal components come from both parents at the time of fertilisation. There is possibility of egg getting fertilised by either X bearing sperm or Y bearing sperm. Egg is always with one X.

A male child thus receives XY chromosomal condition where X comes from mother and Y from father. Males are likely to suffer from diseases caused by genes present on X chromosome.

A female child receives one X from mother and another X from father.