NEET BIOLOGY

Detailed explanation-1: -In humans, the alleles for certain conditions (including some forms of color blindness, hemophilia, and muscular dystrophy) are X-linked.

Detailed explanation-2: -Red-green color blindness is a recessive trait linked to the X chromosome. People who have it can see normally, but can’t distinguish shades of red and green. Among those with Northern European ancestry, it occurs in about 1 in 12 males but only 1 in 200 females.

Detailed explanation-3: -Someone who has one abnormal gene (but no symptoms) is called a carrier. Carriers can pass abnormal genes to their children. The term “sex-linked recessive” most often refers to X-linked recessive.

Detailed explanation-4: -In an X-linked recessive inheritance pattern, the abnormal (mutated) gene is on the X chromosome. Duchenne muscular dystrophy, some types of colorblindness and hemophilia A are examples of X-linked recessive disorders.