PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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1 red, 1 white, 2 roan
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0 red, 1 white, 3 roan
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2 red, 2 white, 0 roan
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0 red, 0 white, 4 roan
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Detailed explanation-1: -Codominance is the form of inheritance in which both alleles of a gene pair are expressed. Complete answer: The cross between a roan bull (Ww) and red cow (WW) produces roan and red phenotypes in 1:1 ratio. A cross between roan bull (Ww) and white cow (ww) produces roan and white phenotypes in 1:1 ratio.
Detailed explanation-2: -If a red cow is bred to a white bull, all offspring are roan, which have red and white hairs intermixed on the hide. This is an example of codominance.
Detailed explanation-3: -A cross between a roan bull and roan cow produces red, roan and white phenotypes in 1:2:1 ratio respectively.
Detailed explanation-4: -Answer and Explanation: The offspring from a mating a roan bull with a white cow will be roan and white in a 1:1 ratio.