Gene for colourblindness is located on

  • A

    Homologous part of $X$-chromosome

  • B

    Non-homologous part of $X$-chromosome

  • C

    Homologous part of $Y$-chromosome

  • D

    Non-homologous part of $Y$-chromosome

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Pattern baldness, moustaches and beard in human males are examples of

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Sickle­cell anaemia is

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Explain thalassemia.

$A$ : The posssibility of a female becoming a haemophilic is extremely rare.
$R$ : Mother of such a female has to be carrier and father should be haemophilic

Mendelian disorder may be of