Question

The following pedigree chart shows the inheritance of a genetic disorder up to three generations of a family. Observe the chart and answer the questions that follow.

(i) Is the disease sex-linked or autosomal as per the chart ? Give reasons in support of your answer.

(ii) Is it a recessive or a dominant disorder?

(iii) Write the genotypes of the individuals 'C', 'D' and 'H'.

(iv)a) If the female 'D' marries a normal man, what will be the probability of their daughter being a sufferer of this disease ?

or

b) If the mother 'B' is a carrier of the disease, what will be the probability of their daughter being a sufferer of this disease ?

Show Answer

Answer :

(i)

• Sex linked disorder

• More males are affected in the family as males have only one X chromosome which if affected expresses

(ii) Recessive disorder

(iii) C -XXᶜ; D- XXᶜ; H- XXᶜ‘c’ is affected allele, accept other symbols used for the same

(iv)

a) Probability 0%

or

b) Probability-50%

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