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    Principles of Inheritance and Variation
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    Write the genotypes of man with blood group A.
    The genotypes of man with blood group A can be IAIA, or IA IO.
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    What for symbols AA and Aa stand ?
    AA : Homozygous dominant, Aa : Heterozygous dominant.
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    What is Mendel’s monohybrid phenotypic ratio ?
    Phenotypic ratio for monohybrid cross is 3 : 1.
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    Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

    (i) Lethality : Sickle cell anaemia.

    (ii) Multiple allelism : ABO blood groups.

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    Mention the phenomenon of pleiotropy by giving an example.
    Pleiotropy. When one gene controls more than one phenotypic character it is termed as pleiotropy.

    Example : Sickle cell anaemia.

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