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Crossing over plays a critical role in increasing the genetic variation among offspring of sexual reproduction. Crossing over is unique to meiosis. Its occurrence depends on specific events early in prophase I, and it has important consequences for the rest of meiosis and beyond.Consider the following statements about crossing over.Drag "True" or "False" to the end of each statement.Crossing over occurs at the ends of chromosomes, rather than near the centromeres.As a result of crossing over, sister chromatids are no longer identical to each other.For crossing over to occur, homologous chromosomes must align precisely early in prophase I so that nonsister chromatids can exchange corresponding segments of DNA.Crossing over prevents homologous chromosomes from separating during meiosis I.

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Crossing over is essential for increasing genetic variety among sexually reproduced offspring.

Meiosis is the only process in which cells cross across. Its presence is dependent on particular processes early in prophase I, and it has significant implications for the remainder of meiosis and beyond.

  • Crossing over happens at the ends of chromosomes, not around the centromeres. True, since segments near the centromere are difficult to split and reattach.
  • True, because there is genetic material interchange between non-sister chromatids, sister chromatids are no longer similar to each other as a result of crossing over.
  • Crossing over occurs when homologous chromosomes exactly align early in Prophase I, allowing non-sister chromatids to swap matching lengths of DNA True
  • False, since homologous chromosomes split during meiosis I.

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