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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 ...
During prophase of meiosis I, the double-chromatid homologous pairs of chromosomes cross over with each other and often exchange chromosome segments. This recombination creates genetic diversity by allowing genes from each parent to intermix, resulting in chromosomes with a different genetic complement.his is the diploid chromosome condition and the paired chromosomes are called homologous. Meiosis transforms a diploid cell into four haploid granddaughter cells, each having a single copy of each chromosome. The process helps increase the genetic diversity of a species.