Meiosis and sexual reproduction are, in large part, responsible for genetic variation within a population. Meiosis supports genetic variation in several ways. All BUT ONE applies to meiosis, sexual reproduction and genetic variation.

Question

Responses
A Meiosis is preceded by DNA replication of chromosomes in the nucleus of the mother cell.Meiosis is preceded by DNA replication of chromosomes in the nucleus of the mother cell.
B As seen in the diagram, during meiosis crossing over, or swapping of DNA segments, may occur.As seen in the diagram, during meiosis crossing over, or swapping of DNA segments, may occur.
C During fertilization each parent randomly contributes a unique set of chromosomes to the zygote.During fertilization each parent randomly contributes a unique set of chromosomes to the zygote.
D Because of recombination and independent assortment during meiosis, each of the four gametes contains a different set of DNA.

Answer 1

The statement that does not directly apply to meiosis, sexual reproduction, and genetic variation is:

A Meiosis is preceded by DNA replication of chromosomes in the nucleus of the mother cell.

While it is true that DNA replication occurs before meiosis, this process itself does not contribute to genetic variation. The other options (B, C, and D) specifically describe mechanisms that create genetic variation (crossing over, random chromosome contribution during fertilization, and independent assortment). Therefore, option A is the correct choice as the exception.