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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 ...
Because pairing and recombination occur during the first meiotic prophase, .... During meiosis, errors in chromosome distribution may occur and lead to chromosomal ... This is â¦ a principal source of the difference between offspring and parents. ... this process (crossing over) is also a source of genetic variation. ... How does crossing-over relate to genetic recombination?