AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: If a red cow is crossed with a white cow the offspring will all be roan, a spotted mixture of red and white.

Detailed explanation-2: -The genotype of a roan cattle is “Ww", that of red is “WW” and that of a white one is “ww". A cross between a roan bull and roan cow produces red, roan and white phenotypes in 1:2:1 ratio respectively.

Detailed explanation-3: -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-4: -Horses with N/Rn genotype will have the classic roan pattern. They may transmit this roan variant to 50% of their offspring. Matings with N/N genotype will result in a 50% chance of producing a roan foal. Horses with Rn/Rn genotype will have the classic roan pattern.