Explain why...?

Question

a male organism with a recessive sex-linked trait usually produces no female offspring with the trait.

Answer 1

Is the trait X-linked or Y-linked.

If it's Y-linked, on the Y-chromosome:
1. The male parent does not pass this chromosome to any of his daughters, so he would not pass the allele for the trait to a daughter.
2. The male parent does pass the Y to his sons.

If it's X-linked, on the X-chromosome:
1. The male parent does pass the X to his daughters, but it's unlikely that the female parent would have this same recessive allele if the allele is not very common in the gene pool. Thus, men with hemophilia usually do not have daughters with hemophilia. However, all their daughters would be carriers.
2. The male parent would not pass the X-linked trait to any sons because the male passes the Y to sons.