Principle of Inheritance and VariationEasyBloom L3
Question
Which is a sex influenced trait?
Options
A.Baldness in man
B.Hairy pinna
C.Porcupine skin in man
D.Colourblindness in man
Solution
Sol.(a) [Key Concept: Sex-Influenced Trait — Baldness] BALDNESS in man is a sex-influenced trait. Sex-influenced traits are controlled by autosomal genes whose expression is influenced by the sex of the individual (hormonal environment). The baldness allele (B) is DOMINANT in males (BB and Bb = bald) but RECESSIVE in females (only BB = bald). Hairy pinna is Y-linked (holandric); porcupine skin is autosomal dominant; colour blindness in man is X-linked recessive (sex-linked, not sex-influenced).
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