All sons of a couple are colourblind because

  • A

    Mother is homozygous colourblind

  • B

    Mother is heterozygous and father normal

  • C

    Mother is heterozygous and father colourblind

  • D

    Mother is normal and father colourblind

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Which of the following is an example of sex-linked disease?

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

  • [AIPMT 2003]

Haemophilia is

Match the following - (w.r.t. Pedigree analysis)

Column $-I$ Column $-II$
$a.$ Solid symbol $(i)$ Carrier of sex linked trait
$b.$ Horizontal line between symbols $(ii)$ Offspring
$c.$ Horizontal line above the symbols $(iii)$ Trait to be studied
$d.$ Dot in centre $(iv)$ Parents

Which of the following is not correct option for Phenylketonuria ?