Human Growth and Development / Unit 2 HGD 0164 short lesson, about 20 seconds
Single-Gene Disorders
Captions available
The idea
Single-gene disorders arise from a pair of recessive alleles or a mutation, which may be spontaneous or caused by hazards such as x-rays.
In practice
Tay-Sachs, cystic fibrosis and sickle cell disease, each traced to a single gene.
Where people slip
Sickle cell disease occurs in about one in three hundred sixty-five Black or African American births, according to the CDC.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
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