Question

10. Is crossing over an important step
in meiosis? Explain your answer.​

Answer 1

Answer:

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Explanation:

• The pairing of homologous chromosomes is a defining characteristic of meiosis.
• Homologous chromosomes pair during prophase stage of meiosis I.
• The prophase stage of meiosis I have substages, leptotene, zygotene, pachytene, diplotene and diakinesis stages.
• Crossing over is a physical exchange of equal pieces of adjacent non-sister chromatids.
• When crossing over occurs, chromatids break and may be reattached to a different homologous chromosome.
• Crossing over occurs during pachytene stage between non-sister chromatids of a pair of homologous chromosomes.