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27 June, 21:25

A cross between a plant with red flowers (R = dominant) and a plant with white flowers (are = recessive) yielded 47 plants with red flowers and 51 plants with white flowers. What are the genotypes of the parent plants

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  1. 27 June, 22:07
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    Red parent: Rr

    White parent: rr

    Explanation:

    Number of red flower plants yielded = 47

    Number of white flower plants yielded = 50

    Ratio of red to white flower = 1:1 approximately

    Let us assume that the genotype of the red parent is heterozygote (Rr), since the white allele is recessive, the genotype of the white parent is definitely rr.

    Rr x rr = Rr (red), Rr (red), rr (white), rr (white)

    Ratio of red offspring to white offspring = 1:1

    Hence, the genotype of the red parent is Rr while that of white parent is rr.
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