Question

Which one of the following is the sex linked character in human inheritance?

• A. Diabetes insipidus
• B. Colour-blindness
• C. Breast in females
• D. Beard in males

Answer 1

Answer: (B)

Colour-blindness

Traits that are determined by alleles carried on the X chromosome are called as X-linked inheritance. One example of an X-linked trait is red-green colorblindness. Let (Xc) represent the recessive allele that causes colorblindness and (X+) represent the normal dominant allele. Females that are X+X+ or X+Xc have normal color vision, while XcXc females are colorblind. Males that are X+Y have normal color vision, while XcY males are colorblind. X chromosome is a sex chromosome. Diabetes, breast in females and beard in males are not sex linked character in human inheritance. Thus, option B is correct and other options are wrong.