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Cats and Genes: 30 Years Later

... recombination is the main supplier of new gene combinations, which feed for natural selection as well as the micro- and macroevolutionary processes. GENETIC RECOMBINATION AS A SOURCE OF HEREDITARY VARIATION Recombination takes place in the first division of meiosis, the process comprising two divisions of a cell and leading to formation of four germ cells containing a single rather than double chromosome set. When preparing for the first division, homologous (paired) chromosomes are juxtaposed and aligned, and multiple double-strand breaks are formed in their DNA. The protein Rad51 is an active player in the repair of DNA breaks: it binds to the free ends of broken DNA strands and inserts them into the DNA of a homologous ...

Modified: 30.12.2009
evolution , chromosomes , meiosis , recombination , genetics
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