A roan bull is crossed with three cows. Cow A | vedclass

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Question

(A) In cattle,coat color exhibits codominance. Let $R$ represent the red allele and $W$ represent the white allele. The genotype for red is $RR$,white

Vedclass · Accepted Answer

$1:2:1$

Vedclass · Answer

(A) In cattle,coat color exhibits codominance. Let $R$ represent the red allele and $W$ represent the white allele. The genotype for red is $RR$,white is $WW$,and roan is $RW$.$1$. Cross between roan bull $(RW)$ and cow $A$ $(RW)$: The offspring genotypes are $1 RR : 2 RW : 1 WW$. Thus,the proportion of roan $(RW)$ offspring is $2/4$ or $1/2$.$2$. Cross between roan bull $(RW)$ and cow $B$ $(RR)$: The offspring genotypes are $1 RR : 1 RW$. Thus,the proportion of roan $(RW)$ offspring is $1/2$.$3$. Cross between roan bull $(RW)$ and cow $C$ $(WW)$: The offspring genotypes are $1 RW : 1 WW$. Thus,the proportion of roan $(RW)$ offspring is $1/2$.Comparing the ratios of roan offspring: $1/2 : 1/2 : 1/2$,which simplifies to $1:1:1$ in terms of probability,but based on the provided options,the question implies the ratio of roan offspring in the respective crosses. Given the standard Mendelian cross outcomes for these genotypes,the correct proportion of roan offspring is $1/2$ for each cross.

$A$ roan bull is crossed with three cows. Cow $A$ has the same genotype as the roan bull,cow $B$ is red,and cow $C$ is white. What should be the proportion of roan offspring in each group of cows?

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