Question

an allele for brown eyes is expressed over an allele for blue eyes. blue eyes are... a recessive trait. a dominant trait. a genotype. a recessive trait, a dominant trait, and a genotype.

Explanation:

In genetics, a dominant allele masks the expression of a recessive allele. Since the brown - eye allele is expressed over the blue - eye allele, the blue - eye trait is recessive. A genotype refers to the genetic makeup (e.g., combination of alleles like \(BB\), \(Bb\), \(bb\)), not a physical trait. A dominant trait would be the one that is expressed when an allele is present (here brown eyes).

Answer:

a recessive trait.