Question

Identify the following mode of inheritance O D (A) autosom al recessive (B) X-linked autosom al dominant (C) X-linked autosomal recessive (D) autosom al dominant​

Answer 1

Answer:

autosomal al recessive the modeof inheritance

Answer 2

The mode of inheritance shown by this pedigree chart is X-linked autosomal recessive.

• In Generation I, we can consider father to be affected by disease (let it be colour blindness), so his chromosomes can be represented as $X^{c}$Y and mother's chromosomes can be represented as XX.
• Their cross leads to 1 son (XY)  and 1 daughter($X^{c}$X) . Thus the daughter is a carrier.
• In Generation II the carrier daughter is crossed with unaffected male (XY) and unaffected son is crossed with affected female ($X^{c}$$X^{c}$).
• In Generation III carrier female and unaffected male produce 2 unaffected daughters ($X^{c}$X and XX), 1 unaffected son (XY) and 1 affected son ($X^{c}$Y).
• Unaffected male and affected female produce 1 affected son($X^{c}$Y).

Hence the correct option is (C) X-linked autosomal recessive.