AP BIOLOGY

Detailed explanation-1: -Recombination Occurs During the Prolonged Prophase of Meiosis I. Prophase I is the longest and arguably most important segment of meiosis, because recombination occurs during this interval.

Detailed explanation-2: -This shuffling process is known as recombination or “crossing over” and occurs while the chromome pairs are lined up in Metaphase I. In Metaphase I, homologous chromosome pairs line up. Homologous chromosomes can exchange parts in a process called “crossing over."

Detailed explanation-3: -Genetic recombination occurs in the pachytene phase of the prophase of meiosis-I.

Detailed explanation-4: -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.

Detailed explanation-5: -Recombination is an integral part of the pairing of homologous chromosomes. It occurs between non-sister chromatids during the pachytene stage of meiosis I (the first stage of meiosis) and possibly before, when the homologous chromosomes are aligned in zygotene (Figure 8.3).