AP BIOLOGY

CELL DIVISION

MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What happens between meiosis I and meiosis II that reduces the number of chromosomes?
A
Crossing-over occurs.
B
Metaphase occurs
C
Replication occurs twice.
D
Replication does not occur.
Explanation: 

Detailed explanation-1: -Homologous pairs of cells are present in meiosis I and separate into chromosomes before meiosis II. In meiosis II, these chromosomes are further separated into sister chromatids. Meiosis I includes crossing over or recombination of genetic material between chromosome pairs, while meiosis II does not.

Detailed explanation-2: -When two gametes come together at fertilization, the normal amount of chromosomes results. Gametes are produced by a special type of cell division known as meiosis. Meiosis contains two rounds of cell division without DNA replication in between. This process reduces the number of chromosomes by half.

Detailed explanation-3: -Chromosome duplication occurs between meiosis I and meiosis II. the genetic alteration of a cell resulting from the direct uptake and incorporation of exogenous genetic material (exogenous DNA) from its surroundings and taken up through the cell membrane(s).

Detailed explanation-4: -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.

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