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In cattle, roan color (mix red and white hairs) occurs in the heterozygous (Rr) offspring of...

In cattle, roan color (mix red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and (rr) homozygous. When two cattle are crossed, what is expected phenotypic frequency among their offspring?

Solutions

Expert Solution

This is a example of incomplete dominance,

Given genotype of Roan cattle - Rr - heterozygote

genotype of red cattle -rr - recessive homozygous

genotype of white cattle - RR- dominant homozygous

Parents - Phenotype Red cattle x White cattle

Genotype rr x RR

Gametes-   r R

Cross:-

F1 - Rr- roan colour

F2 cross

Parents- Phenotye Roan cattle x Roan cattle

Genotype Rr x Rr

Gametes R, r R, r

Cross

R r
R RR- white Rr- roan
r Rr- roan rr- red

Phenotypic ratio- 1 red: 2 roan: 1 white

Expected Frequency of red = 1/4 = 0.25

expected frequency of white = 1/4 = 0.25

expected frquency of roan = 2/4 = 0.5

gladiator answered 2 years ago
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