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NEET2015ZoologyPrinciples of Inheritance and VariationActual

Which is genetically not possible?

Options

  1. AHaemophilic father transfers the haemophilic gene to his son.
  2. BHaemophilic father transfers the haemophilic gene to his daughter.
  3. CCarrier mother transfers the haemophilic gene to her son.
  4. DCarrier mother transfers the haemophilic gene to her daughter.

Correct answer

A. Haemophilic father transfers the haemophilic gene to his son.

Step-by-step solution

Haemophilia is a sex linked disease. It follows criss-cross inheritance in which father does not pass the sex-linked allele of a trait to his son. The same is passed to the daughter, from where it reaches the grandson, i.e., diagynic. It is because the males have only one X -chromosome which is transferred to the female offspring. Only Y-chromosome of the father is transferred to the male offspring but this sex chromosome does not carry the allele for haemophilia. Mother passes the alleles of a sex-linked trait to

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