Question

1. roan is a coat color found in many animals, including horses, cattle and dogs. it is defined generally as an even mixture of white and red hair. what offspring are expected from mating a roan bull and a roan cow? 6. what phenotypes would you expect from a cross between a red bull and a white cow?

Explanation:

Step1: Determine the genetic cross for roan - roan mating

Let R represent the allele for red and r represent the allele for white. Roan is heterozygous (Rr). When Rr (roan bull) is crossed with Rr (roan cow), we use a Punnett - square.

	R	r
r	Rr	rr

Step2: Analyze the genotypes and phenotypes

RR is red, Rr is roan, and rr is white. The genotypic ratio is 1 RR : 2 Rr : 1 rr. So the phenotypic ratio is 1 red : 2 roan : 1 white.

Step3: Determine the cross for red - white mating

A red bull is RR and a white cow is rr. When RR is crossed with rr, all offspring will have the genotype Rr.

Step4: Identify the phenotype of the offspring

Since Rr is roan, all offspring from the cross between a red bull and a white cow will be roan.

Answer:

1. 1 red : 2 roan : 1 white
2. All roan