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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 ...
The separation of homologous chromosomes allows for each homologue to reach each gamete. This enables each daughter cell to have only 23 chromosomes, which is one from each homologous pair. Sister chromatids remain intact during meiosis I but split during meiosis II. After crossing over occurs, the chromatids separate during anaphase II and line up along the equator during metaphase I of meiosis I. Learn more about Biology