How does a mutation in a sex cell affect an organism? a. it stops the organism from making proteins. b. it prevents the organism from forming limbs. c. it will usually kill the organism. d. it only affects the offspring of the organism.

Answer is (D) it only affects the offspring of the organism.

The sex cells present in the body of an organism are required for making the genetic composition of the offspring and its development. A sex cell like the sperm has only half the number of chromosomes present in it. Any mutation in the DNA of the sex cell will affect the development of the offspring or even the chance of sex cell being able to fuse with the sex cell from the other parent.