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A roan bull is bred to three cows. Cow A has the same genotype as the roan bull. cow B is red and cow C is white, what proportions of roan cows are expected in the offsprings of each group of cows?

A roan bull is bred to three cows. Cow A has the same genotype as the roan bull. cow B is red and cow C is white, what proportions of roan cows are expected in the offsprings of each group of cows?

Grade:12th pass

2 Answers

Dr.Adam Shaik
askIITians Faculty 387 Points
7 years ago
Hi Nikhila
This question is related to genetics and alleles.

In the given question consider roan as one gene and other colours as one gene.
Then in CowA -same genotype=100% characters
In Cow-B=Red colour+ roan colour, so 50% colour is roan and dominant colour will appear.
In Cow-C=White colour+ roan colour,so 50% colour is roan and dominant coour will appear
use checker board to solve if you know the Dominant gene among the colours.
Aabid Hussain
askIITians Faculty 576 Points
7 years ago
Hi Nikhila,

Thank you for asking

Colour inheritancein cows and bulls is an example of codominance.
And the genotypes of different colours of cows are as follows:

White colour: WW
Red colour: RR
Roan colour: WR
so, the Roan bull has the genotype WR and the three cows have WW, RR, WR.

Now draw the Punnet square
521-1207_punnet square.JPG

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