Crossing Over
Crossing over
Exchange of corresponding DNA segments between nonsister chromatids of homologous chromosomes during meiosis.
Overview
EXPLORE BY LEVELDuring A cell-division program with two nuclear divisions after one DNA-replication phase; it reduces chromosome-set number and usually creates varied haploid products., paired DNA molecules packaged with proteins. Each replicated chromosome is counted as one until its sister chromatids separate. can exchange matching pieces of DNA. This creates new combinations of inherited versions of genes.
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Research Claims
Crossover number and placement are regulated; recombination also produces noncrossover outcomes. A simple diagram of one exchange is illustrative rather than a complete account of meiotic recombination.