A woman with normal vision, but whose father was colour blind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. Thus boy

  • [AIPMT 2005]
  • A

    Will be partially colour blind since he is heterozygoustor for the colour blind mutant alble

  • B

    Must have normal colour vision

  • C

    Must be colour blind

  • D

    May be colour blind or may be of normal vision,

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Phenylketonuria is a genetic disorder due to a defect in metabolism of the following.

Which one of the following symbols and its representation, used in human pedigree analysis is correct ?

  • [AIPMT 2010]

Which one is a hereditary trait

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased? (In $\%$)

  • [NEET 2021]

If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father ? Comment.