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KVPY Sample Paper KVPY Stream-SX Model Paper-12

  • question_answer
    A plant is heterozygous for a pair of alleles that are codominant. This plant is self-pollinated and the resulting seeds are germinated and allowed to grow. Which ratios are expected in the offspring?

    A)
    Ratio of Phenotypes Ratio of Genotypes
    1 : 2 : 1 1 : 2 : 1

    B)
    Ratio of Phenotypes Ratio of Genotypes
    1 : 2 : 1 3 : 1

    C)
    Ratio of Phenotypes Ratio of Genotypes
    3 : 1 1 : 2 : 1

    D)
    Ratio of Phenotypes Ratio of Genotypes
    3 : 1 3 : 1

    Correct Answer: B

    Solution :

    For a plant with codominant alleles, both characteristics will show, unless the plant has identical alleles. In this case, both the phenotypic and genotypic ratio will be the same. Therefore, the answer could be either [a] or [d]. In case of the option [d], there is only 2 types of outcome, but with 2 alleles, the outcome should be 3 different types. Hence, the answer should be [a].


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