Question

• red cattle = rr (homozygous)
• white cattle = ww (homozygous)
• roan (red & white hair) = rw (heterozygous)

images of pure red (rr), pure white (ww), roan (rw) cattle, and a real roan cattle image
the equal expression of alleles above applies to which of the following
○ mendelian genetics
○ multiple allele traits
○ codominance
○ incomplete dominuance

Explanation:

The scenario shows that both red (RR) and white (WW) alleles are fully and equally expressed in the heterozygous (RW) roan cattle, resulting in both red and white hairs being present. This matches the definition of codominance, where neither allele masks the other, and both are visibly expressed. Mendelian genetics typically involves dominant/recessive traits, multiple allele traits involve more than two alleles for a gene, and incomplete dominance results in a blended phenotype (not distinct traits).

Answer:

codominance