AP BIOLOGY

CELL DIVISION

MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which phase in meiosis II is where the chromosomes line up in the middle?
A
anaphase II
B
metaphase II
C
telaphase II
Explanation: 

Detailed explanation-1: -Figure 5: During metaphase II, the chromosomes align along the cell’s equatorial plate.

Detailed explanation-2: -Metaphase II: During metaphase, each of the 23 chromosomes line up along the center of the cell at the metaphase plate.

Detailed explanation-3: -In meiosis II, the phases are, again, analogous to mitosis: prophase II, metaphase II, anaphase II, and telophase II (see figure below). As shown in the figure below, meiosis II begins with two haploid (n = 2) cells and ends with four haploid (n = 2) cells.

Detailed explanation-4: -During metaphase II, the centromeres of the paired chromatids align along the equatorial plate in both cells. Then in anaphase II, the chromosomes separate at the centromeres. The spindle fibers pull the separated chromosomes toward each pole of the cell.

Detailed explanation-5: -Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I. By meiosis II, only sister chromatids remain and homologous chromosomes have been moved to separate cells. Recall that the point of crossing over is to increase genetic diversity.

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