Вопрос 118

In a report on selective breeding and pedigrees, a student writes that selective breeding created a new allele for larger fruit in a tomato crop. What should the report say instead?

Breeding made an allele that was already present in the crop much more commonПравильный ответ
Breeding created the allele, but only after many generations of crossing
Breeding got rid of the allele for smaller fruit completely in a single generation
Breeding created the allele in the first generation and spread it later

Объяснение

A breeder can only work with the alleles a population already contains, choosing as parents the plants that happen to carry the helpful ones. Over many rounds that choice raises the share of plants carrying those alleles, which looks like something new appearing but is a change in how common they are.

Объяснение

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