Question

16 genetic diseases are caused by a. x chromosomes. c. plasmids. b modified cells. d. mutations.

Explanation:

Genetic diseases result from changes in DNA sequence, which are mutations. X - chromosomes are just a type of chromosome, plasmids are extra - chromosomal DNA in bacteria and not the main cause of human genetic diseases, and modified cells are not the fundamental cause of genetic diseases.

Answer:

D. mutations