Human Growth and Development / Unit 2 HGD 0159 short lesson, about 20 seconds
Beyond Simple Dominance
Captions available
The idea
In incomplete dominance neither allele fully dominates, producing an intermediate trait; in codominance both alleles are fully expressed at once.
In practice
A curly-haired and a straight-haired parent with a wavy-haired child; blood type AB.
Where people slip
The ABO blood group has three alleles and four phenotypes: A, B, AB and O.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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