MEDizzy - Patterned baldness is a sex influenced trait more expressed

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metabolism - Set 4

Patterned baldness is a sex influenced trait more expressed in a male. If b+ is normal allele making non-bald phenotype and b is mutant leading to bald phenotype, for a cross between a bald mother and normal father, what is the probability of a bald son?

ExplanationBaldness is a sex influenced trait, so the mother is certainly b/b and the father is b+,b+. So, the son will get at least one baldness allele from the mother. Heterozygous male expresses the sex influenced trait; hence the son will definitely be bald.