A woman has an X-linked condition on one of her X chromosomes . This chromosome can be inherited by

Options

A. only grand children
B. only sons
C. only daughters
D. Both (b) and (c)

Answer

D

Explanation

In the given problem , woman is the carrier of X-linked condition and she can transmit and the carrier allele to both her son and daughter . The resulting son will become diseased because X-linked disorder always affect males due to the presence of single X-chromosome.
The daughter offspring will become carrier but not diseased because females are affected by X-linked disorder in homozygous recessive condition i.e. two recessive alleles are required .

Hence , 50% son are diseased and 50% are normal . Similarly , 50% daughter are carrier and 50% are normal.