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As a result of crossing over, sister chromatids are no longer identical to each other. Blanktarget 1 of 4

Crossing over occurs at the ends of chromosomes, rather than near the centromeres. Blanktarget 2 of 4
Crossing over prevents homologous chromosomes from separating during meiosis I. Blanktarget 3 of 4
For crossing over to occur, homologous chromosomes must align precisely early in prophase I so that nonsister chromatids can exchange corresponding segments of DNA. Blank

1 answer

  1. False - As a result of crossing over, sister chromatids are no longer identical to each other. (Sister chromatids remain identical; it’s the homologous chromosomes that become non-identical due to crossing over.)

  2. False - Crossing over occurs at the ends of chromosomes, rather than near the centromeres. (Crossing over generally occurs at various points along the chromosomes, including near the centromeres, not just the ends.)

  3. False - Crossing over prevents homologous chromosomes from separating during meiosis I. (Crossing over allows for genetic diversity, but does not prevent the separation of homologous chromosomes during meiosis I; rather, it facilitates proper segregation.)

  4. True - For crossing over to occur, homologous chromosomes must align precisely early in prophase I so that nonsister chromatids can exchange corresponding segments of DNA. (This statement is accurate.)