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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 ...
Homologous chromosomes split during the anaphase stage of Meiosis 1. Related Questions. Do all of the crossing-over events during meiosis happen only on one of the sister chromatids (and one of the sister chromatids of the other h... Why do the 19, 20, and 21 chromosomes have risks of not separating more than the others? Do non-homologous sex chromosomes undergo synapsis?