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Answers. Best Answer: Cross-over is a gene swapping process that occurs only in meiosis at prophase-1. Cross-over is one part of gene mixing that leads to the expression of new traits (phenotypes) in development after fertilization. For example: (The two rounds of division ... meiosis 1 and meiosis 2 ...
Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest. During meiosis, two successive nuclear divisions happens namely Meiosis I or reduction and Meiosis II or division. In meiosis I, it separate chromosomes after allowing crossing over. In meiosis II, it the then separates each chromosomes by splitting them. This division produces 4 haploid cells.