GENETICS AND EVOLUTION
MOLECULAR BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In pigs, the allele for black hair is dominant to the allele for red hair. Two black-haired pigs mated and produced twelve offspring. Of the first eleven, eight had black hair and three had red hair. What is the probability of the twelfth offspring having red hair?
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0.75
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0.50
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0.33
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0.25
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Explanation:
Detailed explanation-1: -In guinea pigs, the allele for black coat color (B) is dominant over the allele for white coat color (b). In an ideal mouse population exhibiting Hardy-Weinberg equilibrium of 31 guinea pigs, 2 are homozygous dominant, 11 are heterozygous, and 18 are homozygous recessive.
Detailed explanation-2: -If heterozygous black pigs where intercrossed then the the probability that the first two offspring is black is 75%. Explanation: The black colour in case of pigs is the dominant character which is exhibited by most of the similar features.
Detailed explanation-3: -So, the correct option is ‘25%’.
Detailed explanation-4: -The phenotypic ratio is 3:1 (3 black and 1 white)
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