Observe the given pedigree chart and answer the following questions(a)

1.	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: 1. First Generation : Carrier woman marrying a sufferer man. Their three children are in following birth order. 2. Second generation : First son is normal, second daughter is carrier and third daughter is sufferer. 3. Third generation : The sufferer daughter marries a normal man. Her children are normal daughter and sufferer son. (a) The above pedigree show sex-linked (Xlinked) 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.

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:

1. First Generation : Carrier woman marrying a sufferer man. Their three children are in following birth order.

2. Second generation : First son is normal, second daughter is carrier and third daughter is sufferer.

3. Third generation : The sufferer daughter marries a normal man. Her children are normal daughter and sufferer son.

(a) The above pedigree show sex-linked (Xlinked) 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.