Observe the given pedigree chart and answer the following questio… - Vidyadip

Question

Observe the given pedigree chart and answer the following questions

(a) Identify whether the trait is sex-linked or autosomal.
(b) Give an example of a trait in human beings which shows such a pattern of inheritance.

✓

Answer

Pedigree given above shows:

First Generation : Carrier woman marrying a sufferer man. Their three children are in following birth order.
Second generation : First son is normal, second daughter is carrier and third daughter is sufferer.
Third generation : The sufferer daughter marries a normal man. Her children are normal daughter and sufferer son.

(a) The above pedigree show sex-linked (X-linked) trait. Since criss-cross inheritance is seen in the trait, it must be sex-linked inheritance.
(b) Such trait and its inheritance can be seen in colour blindness.

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