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In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (CRCW) offspring of red (CRCR) and white (CWCW) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red: 2 roan: 1 white?
a) red x white.
b) roan x roan.
c) white x roan.
d) red x roan.
e) all of the above crosses would give the same percentage of roan.

Respuesta :

daleylsparacino

Answer:

A

Explanation:

RedStringTheory

Answer: B : roan x roan.

Explanation:

Only Roan x Roan has the ability to provide 1:2:1 ratio given that if White x White were to be crossed you'd have 100% white cattle offspring. Alternatively, if red x red were crossed, you'd get 100% red. Therefore, these can be rejected. Now, if red x white were crossed, the results would be all heterozygous C^R/C^W, making the offspring have a phenotype of 100% roan. The only correct answer could be roan x roan for the desired ratio.

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