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  • A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be the probability of her sons and daughters to be colour blind? Explain with the help of a pedigree chart.

A normal visioned woman, whose father is colour blind, marries a normal visioned man. What would be the probability of her sons and daughters to be colour blind? Explain with the help of a pedigree chart.

Answers (1)

The pedigree analysis shown below depicts the colour blindness in offspring:

  • The F1 generation depicts two female children and one male child – One of the female children might be a carrier, and the male child will suffer from colour blindness.
  • The P generation depicts a normal husband and a carrier wife.

About 8% of the males are colour blind, while only 0.5% of the females are colour blind. This is because only one X-chromosome is present in males. If that one X-chromosome carries the defect, the boy will suffer from colour blindness. But in females, there are two X chromosomes which help in the compensation of deficiency in one of the chromosomes. Thus, females are generally carriers of the disease and rarely the sufferer.

 

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infoexpert23

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