Question at position 73 Crossing over between homologous chromosomes occurs during ____ and homologous chromosomes separate from each other during ____.prophase I; anaphase IIprophase II, telophase Iprophase I; anaphase Iprophase II; telophase II

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Restating the question helps set the framework: Crossing over between homologous chromosomes occurs during a specific stage, and the separation of homologous chromosomes occurs during another stage. The pair of stages in the correct biology sequence is prophase I for crossing over, and anaphase I for the separation of homologous chromosomes.
Option A: 'prophase I; anaphase II' — Crossing over happens in prophase I, but the separation of homologous chromosomes is not during anaphase II; that occurs in meiosis II when sister chromatids separate. This makes the second part of the statement incorrect.
Option B: 'prophase II, telophase I' — This mixes stages from different meiotic phases: prophase II is in meiosis II and not the stage for crossing over, while telophase I is a stage where homologous chromosomes have already been separated, not where they separate. Overall, this option incorrectly pairs the processes with wrong stages.
Option C: 'prophase I; anaphase I' — This aligns with standard meiosis: crossing over occurs in prophase I, facilitated by synapsis and recombination between homologous chromosomes, and homologous chromosomes separate during anaphase I as they are pulled to opposite poles. This option matches the established sequence.
Option D: 'prophase II; telophase II' — Both stages here belong to meiosis II and do not correspond to crossing over or the separation of homologous chromosomes. Crossing over does not occur in prophase II, and homologous chromosomes have already separated by this point. This option confuses the timing and the responsible events.
In summary, the only option that correctly matches the biology of crossing over and homologous chromosome separation is the one that places crossing over in prophase I and the separation of homologous chromosomes in anaphase I, while the other options misuse the stages or pair them with incorrect processes.

Question at position 73 Crossing over between homologous chromosomes occurs during and homologous chromosomes separate from each other during .prophase I; anaphase IIprophase II, telophase Iprophase I; anaphase Iprophase II; telophase II

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