AP BIOLOGY

Detailed explanation-1: -A red bull is crossed with a white cow and all of the offspring are roan, an intermediate color that is caused by the presence of both red and white hairs.

Detailed explanation-2: -If a red cow is bred to a white bull, all offspring are roan, which have red and white hairs intermixed on the hide. This is an example of codominance.

Detailed explanation-3: -Complete answer: The cross between a roan bull (Ww) and red cow (WW) produces roan and red phenotypes in 1:1 ratio. A cross between roan bull (Ww) and white cow (ww) produces roan and white phenotypes in 1:1 ratio.

Detailed explanation-4: -In codominance a heterozygous individual expresses both simultaneously without any blending. An example of codominance is the roan cow which has both red hairs and white hairs.