And the changes are handed down: While most of the chimp genome's 24
pairs of chromosomes undergo a genetic reshuffling during the production of sperm and eggs, with genes swapped between the two copies, there is only one Y chromosome and thus no mixing — the Y is transmitted intact.
Not exact matches
This surprising finding, reported by Whitehead Institute scientists in a paper published online this week in the journal Nature Genetics, is
paired with another unexpected outcome: despite its reputation as the most stable
chromosome of the genome, the X has actually been
undergoing relatively swift change.
Recombination refers to the formation
of new combinations
of genes naturally during meiosis, which is a stage
of the cell cycle where
chromosomes pair up and
undergo exchange.
In meiosis, which is required in sexual reproduction, one diploid cell (having two instances
of each
chromosome, one from each parent)
undergoes recombination
of each
pair of parental
chromosomes, and then two stages
of cell division, resulting in four haploid cells (gametes).