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Principles of Inheritance and Variation

    • Question 1
    CBSEENBI12000179
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    Name one trait that does not blend.

    Solution
    Sex trait .
    Question 2
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    Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

    Solution
    (i) Lethality : Sickle cell anaemia.

    (ii) Multiple allelism : ABO blood groups.

    Question 3
    CBSEENBI12000181
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    What for symbols AA and Aa stand ?

    Solution
    AA : Homozygous dominant, Aa : Heterozygous dominant.
    Question 4
    CBSEENBI12000182
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    Mention the phenomenon of pleiotropy by giving an example.

    Solution
    Pleiotropy. When one gene controls more than one phenotypic character it is termed as pleiotropy.

    Example : Sickle cell anaemia.

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