GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Tan, because W is dominant
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Brown because R is dominant
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Tan with brown spots because both W and R are dominant
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Light brown because WR is hybrid
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Detailed explanation-1: -Codominance results in two phenotypes being expressed in different parts of an animal. For example, a Holstein cow has black and white spots. This results from a “white” allele and a “black” allele that are each fully expressed in different parts of the organism.
Detailed explanation-2: -In shorthorn cattle, when a red bull (R R) is crossed with a white cow (WW), all the offspring are roan-a spotted, red and white or milky red color.
Detailed explanation-3: -Coat color is an instance of codominance in short-horned cattle. The F1 hybrids have no black or white coat color if a cattle with a black coat is crossed with a cattle with a white coat, but have roan coat color, where patches of black and white appear separately.
Detailed explanation-4: -Complete answer: A cross between roan bull (Ww) and white cow (ww) produces roan and white phenotypes in 1:1 ratio.