AP BIOLOGY

CELL DIVISION

MEIOSIS AND GENETIC VARIATION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Homologous chromosomes line up along the equator of the cell during which stage of meiosis?

A	Prophase I
B	Anaphase II
C	Metaphage I
D	Metaphase II
E	Prophase II

Explanation:

Detailed explanation-1: -In metaphase I, the homologous pairs of chromosomes align on either side of the equatorial plate. Then, in anaphase I, the spindle fibers contract and pull the homologous pairs, each with two chromatids, away from each other and toward each pole of the cell. During telophase I, the chromosomes are enclosed in nuclei.

Detailed explanation-2: -During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent.

Detailed explanation-3: -Metaphase II: The paired chromosomes line up. Anaphase II: The chromatids split at the centromere and migrate along the spindle fibers to opposite poles. Telophase II: The cells pinch in the center and divide again. The final outcome is four cells, each with half of the genetic material found in the original.

There is 1 question to complete.