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Principles Of Inheritance And Variation

Question
CBSEENBI12003346
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Which is genetically not possible

  • Haemophilic father transfers the haemophilic gene to his son.

  • Haemophilic father transfers the haemophilic gene to his daughter.

  • Carrier mother transfers the haemophilic gene to her son.

  • Carrier mother transfers the haemophilic gene to her daughter

Solution

A.

Haemophilic father transfers the haemophilic gene to his son.

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 both sons and daughters.

Some More Questions From Principles of Inheritance and Variation Chapter

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What do the symbols square and circle in a pedigree chart indicate ?

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How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

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