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In shorthom cattle, hair color is governed by co-dominant alleles Red alleles are co-dominant with
white alleles, and heterozygotes have red and white hairs. They are called roans. Cross two roans.
What is the genotypic and phenotypic probability of this cross?

Respuesta :

2. In crossing a homozygous recessive with a heterozygote, what is the chance of ... In cattle, roan color (mixed red and white hairs) occurs in the heterozygous (Rr) ... with another roan (Rr x Rr), will result in 1:2:1 genotypic and phenotypic ratio. ... In humans, the allele for short fingers is dominant over that for long fingers.Answer:

Explanation:

Histrionicus

The genotypic probability - Β 

25% RR red

50% Rr, roan

25% rr, white

The phenotypic probability - Β 

25% red

50% roan

25% white

Incomplete dominance is a type of inheritance where none of the alleles completely dominates over the other allele.

Dominant alleles cannot completely cover up the recessive alleles.

Given:

The genotype RR - red hair

The genotype rr - white hair

The genotype Rr - roan or both color hair present

Then cross between two Roans - Β 

Β  Β Rr x Rr

cross:

Β  Β  Β  R Β  Β  r

R Β  Β RR Β Rr

r Β  Β  Rr Β  rr

Thus, Β 

The genotypic probability - Β 

25% RR red

50% Rr, roan

25% rr, white

The phenotypic probability - Β 

25% red

50% roan

25% white

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