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9 April, 14:31

How many possible genotypes and phenotypes are there for a single gene trait that shows dominance in any given population? A. One genotype, one phenotype

B. Two genotypes, two phenotypes C. Three genotypes, two phenotypes D. Two genotypes, three phenotypes

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Answers (2)
  1. 9 April, 14:59
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    Let D be the dominant allele and d be the recessive allele. Possibilities:

    DD (dominant phenotype)

    Dd (dominant phenotype)

    dd (recessive phenotype)

    Therefore, there are three genotypes, two phenotypes.

    The answer is C.
  2. 9 April, 16:59
    0
    The answer is C. Three genotypes, two phenotypes.

    Imagine gene for flower colors. Let A allele be dominant and a allele be recessive allele for the trait. A allele is responsible for red color and a allele for white color

    The genotypes are:

    1. AA

    2. Aa

    3. aa

    However, there will be only two phenotypes:

    1. red flowers

    2. white flowers

    This is because of the dominance of A allele over a allele. So, red flowers will have plants with genotypes AA and Aa while white flowers will have plants with genotype aa.
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