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A colour blind man marries the daughter of a colour blind man. Then in their progeny:

A colour blind man marries the daughter of a colour blind man. Then in their progeny: Correct Answer 50% sons will be colour blind

Concept-

  • Colour blindness condition is usually passed down from the parents' side which is a common hereditary condition.
  • A man having color blindness can’t receive a color-blind ‘gene’ from his father, even if his father is color blind because his father can pass an X chromosome to his daughters only.
  • A daughter with color blindness, therefore, must have a father who is color blind and a mother who is a carrier (who has also passed the faulty ‘gene’ to her daughter).
  • If her father is not color blind, a ‘carrier’ daughter won’t be color blind.
  • A daughter can become a carrier in one of two ways – she can acquire the ‘gene’ from a carrier mother or from a color-blind father.
  • Color blindness is a genetic disposition.
  • It is also known as color deficiency.

Explanation-

  • Color blindness is a recessive sex-linked trait.
  • Father transfers its X chromosome to the daughters.
  • The colorblind father will transfer its carrier X chromosome to the daughter.
  • The women will be a carrier for colorblindness XXc.
  • The colorblind man will be XcY.
  • The carrier female and color blind man will inherit the disease to 50% sons and 50% daughters. 

Thereby a color-blind man marries the daughter of a color-blind man. Then in their progeny, 50% of sons will be color blind.

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