Selection in which nature provides variation of traits, but humans decide which are the most useful and breed organisms to have those traits.

In familial hypercholesterolemia individuals homozygous for the allele causing the disorder completely lack receptors on liver cells that take up cholesterol from the blood stream. heterozygous have one-half the number of receptors while individuals homozygous for the normal allele are phenotypically normal. this is an example of a.epistasis b.complete dominance c. incomplete dominance d. codominance

Analogy- 1 is to arete as 5 is to cirque horn glacial valley hanging valley

Environmental impacts on evolution : mastery test