Հարց 102

A population contains an allele that has never been present in it before. Which process produced that allele?

Selective breeding by people
Natural selection acting on the population
Mutation of an existing alleleՃիշտ պատասխան
A change in the climate the population lives in

Բացատրություն

A new allele is a new version of a gene, and a version that did not exist before can only come from a change to the DNA sequence itself. Selection and changing conditions decide which of the versions already present become common, but neither of them writes a new version.

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