Question

An example of Mendelian disorder is:

• A. Klinefelter's syndrome
• B. Night blindness
• C. Down's Syndrome
• D. Turner's syndrome

Hint:

Mendelian disorders involve single genes, while chromosomal disorders (like Down, Turner, Klinefelter) involve issues with whole chromosomes.

Answer 1

The Correct Option is B

Mendelian disorders are conditions caused by mutations in a single gene. Klinefelter's, Down's, and Turner's syndromes are chromosomal disorders, caused by an abnormal number of chromosomes. Certain forms of congenital stationary night blindness are inherited as Mendelian traits (autosomal dominant, autosomal recessive, or X-linked). While night blindness can also be caused by Vitamin A deficiency, its inherited forms are Mendelian.