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11 April, 06:22

In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short?

A) 1

B) 1/2

C) 1/4

D) 1/6

E) 0

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Answers (1)
  1. 11 April, 09:13
    0
    The answer is E) 0.

    If:

    A - dominant allele,

    a - recessive allele,

    then:

    AA - dominant homozygous (tall),

    aa - recessive homozygous (short),

    Aa - heterozygous (tall).

    A heterozygous plant (Aa) is crossed with a homozygous tall plant (AA):

    Parental generation: Aa x AA

    F1 generation: AA AA Aa Aa

    All of the offspring is tall (AA or Aa), since tall is dominant to short.

    There is no chance for offspring to be short (aa).
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