CELL DIVISION
MEIOSIS AND GENETIC VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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B-black, b-brown. Two black mice mate and have some black and some brown mice. What is the genotype of the parents?
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BB x Bb
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BB x bb
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Bb x Bb
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Bb x bb
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Explanation:
Detailed explanation-1: -Brown mice have the genotype BB or Bb. White mice have the genotype bb. The frequency of the BB genotype is 0.30.
Detailed explanation-2: -According to Mendelian Genetics, the unknown black mouse being tested could be BB or Bb genotype. In order to determine the genotype, it would be test crossed with a bb (white fur phenotype) genotype. If the results from this test cross were all black mice (Bb) then the unknown black mouse genotype would be BB.
Detailed explanation-3: -The most likely genotype of the brown parent would be homozygous dominant, which would lead to all puppies being heterozygous and brown. All offspring will be Bb and express the dominant brown phenotype.
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