PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Suppose that in sheep, a dominant allele (B) produce black hair and a recessive allele (b) produce white hair. If you saw a black sheep, you would be able to identify
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its phenotype for hair color
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its genotype for hair color
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the genotype of only one of its parents
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the phenotype of both of its parents
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Explanation:
Detailed explanation-1: -Black wool in sheep is recessive (w) to white wool which is dominant (W). A white ram is crossed with a white ewe. Both parents carry the allele for black (w). They produce a white ram lamb which is then back crossed to the female parent.
Detailed explanation-2: -The parent’s Genotype is Heterozygous. Two white sheep producing a black offspring implies that white color is translated due to the presence of a dominant allele. Black color is translated due to presence of both the recessive alleles in the offspring.
Detailed explanation-3: -An allele W, for white wool, is dominant over allele w, for black wool. In a sample of 900 sheep, 891 are white and 9 are black.
There is 1 question to complete.