Biology / Unit 4 Bio 0829 short lesson, about 20 seconds
Gene and Allele, Locked Terms
Captions available
The idea
A gene is a DNA segment at a fixed location coding for a protein; an allele is one version of its sequence, and this course fixes both terms accordingly.
In practice
Blood type is set by one gene with three alleles — A, B, and O.
Where people slip
A gene names the location; an allele names one sequence found there.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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