Biology / Unit 8 Bio 1673 short lesson, about 20 seconds
Genetic Variation from Mutation and Sexual Reproduction
Captions available
The idea
Genetic variation arises from two sources: mutation, per Unit 6's Bio 1309, which creates new alleles, and sexual reproduction, which reshuffles existing alleles.
In practice
Meiosis's independent assortment and crossing over, per Unit 5's Bio 0961, combine existing alleles into genotypes no parent carried.
Where people slip
Mutation creates new alleles; sexual reproduction only recombines existing ones — recombination alone cannot generate a new allele.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Something wrong in this lesson? Flag it · Sources for Biology