I keep getting “Sex-linked inheritance” questions wrong in Principles of Inheritance & Variation. What's the trap?
thinking sex-linked traits affect both sexes equally.
The usual trap: thinking sex-linked traits affect both sexes equally. How to avoid it: males have one X, so a single recessive X allele shows up in them. Go back to the definition — genes on the X chromosome (like those for haemophilia and colour blindness) affect males more often.
Key point
Sex-linked inheritance
Common mistake
thinking sex-linked traits affect both sexes equally.
Memory tip
males have one X, so a single recessive X allele shows up in them.
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