Answer:
A man and woman are both heterozygous for the pattern-baldness allele, but only the man loses his hair. This is an example of sex-influenced trait.
Explanation:
"Sex-influenced traits" are traits that are inherited autosomal genes and are influenced by sex. If male has one suppressed allele, the trait will be visible in him, but to show the same trait in females, two suppressed or recessive alleles are required.
One such gene is baldness. "Pattern baldness" is a "sex-influenced trait". Heterozygous males will usually express this trait but heterozygous females will not. As per the given statement, only man is loosing hair, so this is an exmaple of sex-influenced trait.
