Q161 / 180 · NEET 2016 (Phase 2) · Zoology

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

  • Correct answer
    A
    0%
  • B
    50%
  • C
    75%
  • D
    100%

Solution

Colour blindness is an X-linked recessive disease and shows criss-cross inheritance. If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is 0%.

Figure

100% - carrier daughters (Phenotypically normal)

100% - Normal son

Hence, the correct answer is option: 'A'.

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