Question

Let's see who can solve this c:

A roan bull is bred to three cows. Cow A has the same genotype as 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.

Answer Choices are
2,1,1
1,2,1
1,1,2
3,1

Answer 1

with group of cows do you mean ofspring of 2 of the 3 cows? like AB AC and BC?

Answer 2

R is red, W is white and the genotype RW leads to roanness

A:RWX RW: 25% RR 50% RW 25% WW
B:RRXRW: 50% RW 50% RR
C:WWX RW: 50% RW 50% WW

so in every group half of the cows is roan

Answer 3

@shreehari499

Answer 4

But there's no option like that so wait..lemme try it

Answer 5

I think there's an involvement of codominance

Answer 6

WW- Red bull
Ww- Roan
ww- White

Answer 7

Ww(roan bull) * Ww (roan cow)
We get WW,Ww,Ww,ww so the no. of roan bull is 2

Answer 8

2nd,
Ww ( roan bull)* WW(red cow)
We get WW and Ww so the ratio no.of roan bull is 1

Answer 9

3rd,
Ww (Roan bull) * ww (White cow)
We get Ww and ww Ratio of no of roan bull is 1

Answer 10

So the answer is 1 i.e 2:1:1

Answer 11

Is it correct @Abhisar ?
I'll be back soon!

Answer 12

Yes, that's correct. Since the question is asking proportions.

Answer 13

@niels5x9 , your concept is correct.