Question

Sex-linked disorders such as color blindness and hemophilia are

• A. Caused by genes on the X chromosome
• B. Caused by genes on the autosome
• C. Caused by genes on the Y chromosome
• D. Expressed only in men

Answer 1

The correct option is A Caused by genes on the X chromosome

Genes for sex linked inheritance are usually by definition present on sex chromosomes. Of the two sex chromosomes, genes for sex linked inheritance are usually present on X chromosome and very less number of genes have been reported on Y chromosome. Red-green color blindness and hemophilia A are X-linked recessive disorders.

Thus, the correct answer is option A.