Question

Throughout the years, many crops and domestic animals have been selectively bred for desirable traits. For example, domestic dogs have been bred for characteristics such as temperament, color, and size.

How can artificial selection by humans change the genetic makeup of such species?
A.
Some traits could become less common than they naturally would be.
B.
Some traits could become more common than they naturally would be.
C.
It could result in changes to the genetic diversity within the species.
D.
all of these

Answer 1

D. all of these

Artificial selection changes allele frequencies by favoring certain traits (making some alleles/traits more common) and disfavoring others (making them less common). Repeated selective breeding also alters overall genetic diversity (often reducing it through inbreeding or selective sweeps), so all three statements are true.