AP BIOLOGY

CELL DIVISION

MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
DNA replication occurs before meiosis I but not before meiosis II. Why is that important?
A
It results in uneven division of the cytoplasm.
B
It results in increased genetic diversity for the species.
C
It results in offspring that are genetically identical to the parents.
D
It results in daughter cells with the haploid number of chromosomes.
Explanation: 

Detailed explanation-1: -Haploid gametes lead to the fusion of male and female gametes, by which a diploid zygote is formed and the number of chromosomes remains the same in the progeny.

Detailed explanation-2: -Cells must replicate their DNA before they can divide. This ensures that each daughter cell gets a copy of the genome, and therefore, successful inheritance of genetic traits.

Detailed explanation-3: -Answer and Explanation: The event that occurs between meiosis I and meiosis II is called the second interphase or interphase II. In contrast with interphase I where DNA replication does occur, in interphase II DNA does not replicate. This is primarily because during interphase II no S-phase occurs.

Detailed explanation-4: -Gametes are haploid cells with only one copy of each chromosome in each cell. Simply put, if gametes are not haploid, species with the same chromosomal number will not be preserved. Meiosis, a kind of cell division, is used to create these reproductive cells.

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