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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 ...
Meiosis occurs in two distinct phases: meiosis I and meiosis II. There are many similarities and differences between these phases, with each phase producing different products and each phase being as crucial to the production of viable germ cells. What Happens Before Meiosis?