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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 I: This is basically like the PMATI of a regular mitosis. Pairs of chromosomes are lined up at the center of the cell and then pulled to each side. Meiosis is a bit different because there something called crossing-over happens with the DNA. This crossing over is an exchange of genes. The genes are mixed up, not resulting in a perfect duplicate like mitosis. The cell divides, leaving two new cells with a pair of chromosomes each.