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Answered

In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red:2 roan:1 white?

Ared × white
Broan × roan
Cwhite × roan
Dred × roan
EThe answer cannot be determined from the information provided.

Verified Answer :

JcAlmighty

The answer is B) roan x roan.

Let's summarize:
R - dominant allele,
r - recessive allele,
RR - dominant homozygous with red color,
rr - recessive homozygous with white color,
Rr - heterozygous with roan color.

If we cross two heterozygous (Rr):

Parents:         Rr     x     Rr
Offspring:      RR   Rr   Rr   rr

then, the offspring will be: 1 red (RR) : 2 roan (Rr, Rr ) : 1 white (rr).

anascensiawarr

Answer:

roan x roan

Explanation: