In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (CRCW) offspring of red (CRCR) and white (CWCW) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white?
A) red × white
B) roan × roan
C) white × roan
D) red × roan

Question

Quizplus · Accepted Answer

Crossing two roan cattle (CRCW × CRCW) would produce offspring in the ratio of 1 red (CRCR):2 roan (CRCW):1 white (CWCW), as this is a classic example of a 1:2:1 genotypic ratio in a simple Mendelian inheritance involving codominance.

In Cattle, Roan Coat Color (Mixed Red and White Hairs)