To determine the correct statement about the illustration you referenced, we need more context about the illustration itself. However, based on the responses provided, I can clarify the terms:
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Chromatids have switched - This could refer to crossing over during meiosis, where homologous chromosomes exchange genetic material, resulting in chromatids that have a mix of genetic information from both parents.
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Genetic variation within chromosomes has increased - This typically relates to crossing over during meiosis, which increases genetic diversity.
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Meiosis II has begun - This would refer to the second stage of meiosis, where the sister chromatids are separated, occurring after meiosis I.
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A diploid cell has become haploid - This statement is true after meiosis I, where homologous chromosomes are separated, resulting in haploid cells.
If the illustration you are referring to shows cells after meiosis I, then the correct statement would be "A diploid cell has become haploid."
If the illustration depicts crossing over, then "Chromatids have switched" or "Genetic variation within chromosomes has increased" could be correct.
If it clearly represents the onset of the second phase of meiosis, then "Meiosis II has begun" would apply.
Please provide details or describe the illustration for a more accurate assessment.