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