AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
During which phase of meiosis are sister chromatid pulled apart?
A
Anaphase 2
B
Anaphase 1
C
Metaphase 2
D
Prophase 2
Explanation: 

Detailed explanation-1: -Anaphase II: During anaphase II, the centromere splits, freeing the sister chromatids from each other. At this point, spindle fibers begin to shorten, pulling the newly-separated sister chromatids towards opposite ends of the cell.

Detailed explanation-2: -The two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles. In metaphase II, the chromosomes line up individually along the metaphase plate. In anaphase II, the sister chromatids separate and are pulled towards opposite poles of the cell.

Detailed explanation-3: -Anaphase II The sister chromatids are pulled apart by the kinetochore microtubules and move toward opposite poles. Non-kinetochore microtubules elongate the cell. Figure 1. The process of chromosome alignment differs between meiosis I and meiosis II.

Detailed explanation-4: -During anaphase II, microtubules from each spindle attach to each sister chromatid at the kinetochore. The sister chromatids then separate, and the microtubules pull them to opposite poles of the cell.

Detailed explanation-5: -Anaphase II is the third stage in meiosis II. It is the stage after metaphase II, which is that phase wherein the chromosomes are at the equatorial plane and spindle fibers are attached to the kinetochores.

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