Question

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.

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 ) 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.


C ) Because of recombination and independent assortment during meiosis, each of the four gametes contains a different set of DNA.Because of recombination and independent assortment during meiosis, each of the four gametes contains a different set of DNA.


D ) As seen in the diagram, during meiosis crossing over, or swapping of DNA segments, may occur.

Answer 1

Step-by-step explanation:

All of the options A, B, C, and D, except for one, apply to meiosis, sexual reproduction, and genetic variation. The exception is:

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

DNA replication is not directly responsible for genetic variation in meiosis and sexual reproduction. Instead, genetic variation is primarily a result of the processes of recombination, independent assortment, and fertilization.

Option B is correct because during fertilization, each parent contributes a unique set of chromosomes, which combine randomly to form the zygote. This random combination of genetic material leads to genetic variation.

Option C is also correct because during meiosis, recombination and independent assortment lead to each of the four gametes containing a different set of DNA, which contributes to genetic variation.

Option D is correct because during meiosis crossing over, or the swapping of DNA segments, can occur, leading to the production of gametes with different combinations of genetic material.

Therefore, option A is the option that does not apply to meiosis, sexual reproduction, and genetic variation.