Human Growth and Development / Unit 2 HGD 0160 short lesson, about 20 seconds
X-Linked Recessive Traits
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The idea
X-linked recessive traits are carried on the X chromosome, so they affect more males, who need the allele from their mother alone.
In practice
Red-green colourblindness, far commoner in males than in females for this reason.
Where people slip
A female needs the allele from both parents to show the trait; with one copy she is a carrier.
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