When homologous chromosomes cross over, what occurs? 1. Two chromatids get tangled, resulting in one re-sequencing its DNA. 2. Corresponding segments of non-sister chromatids are exchanged. 3. Two sister chromatids exchange identical pieces of DNA. 4. Maternal alleles are "corrected" to be like paternal alleles and vice versa.
Added by Michelle V.
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Two chromatids getting tangled and re-sequencing their DNA is not the main purpose of crossing over. So, this option is not correct. Show more…
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