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  • With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in F generation.

Q.104) With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in F generation.

A) Zero

B) 1/4

C) 1/2

D)  1/8

Answers (1)

best_answer

Q.104) The disease is X-linked recessive (seen in males, and females are carriers). The F? generation includes a carrier female (heterozygous) and an affected male (hemizygous recessive), producing the F? generation.

Their children have these possible outcomes:

  • 25% Affected male (X?Y)

  • 25% Carrier female (X?X)

  • 25% Unaffected male (XY)

  • 25% Unaffected carrier female (X?X) ← This matches the question.

Thus, the probability of an unaffected carrier child is 1/4.

Posted by

Parbin Huda Baruah

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