Q.Why are sex linked recessive characters more common in the male human beings?

Step 1. Recall the chromosomal basis: in the human XY system, a male has only one X chromosome (paired with a structurally different Y that carries few, if any, matching alleles), while a female has two X chromosomes.

Step 2. Apply this to a recessive X-linked allele: a male carrying that allele on his single X is hemizygous for it — there is no second X copy that could carry a dominant, masking allele — so the recessive phenotype is expressed immediately, with only one copy needed. …

Contrast male hemizygosity (one X, no masking) against female's need for two recessive copi …

• Explaining this purely by 'males have a Y chromosome' without connecting it to hemizygosity …