Biology / Unit 5 Bio 1047 short lesson, about 20 seconds
X-Linked Inheritance
Captions available
The idea
An X-linked trait's gene sits on the X chromosome, so a male, with only one X, expresses whatever allele that single X carries.
In practice
A Drosophila male with one X-linked white-eye allele shows the trait, with no second allele to mask it.
Where people slip
A male's single X leaves him hemizygous at every X-linked locus — dominance applies differently there than at an autosomal locus.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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