When the non-sister chromatids intertwine, segments of chromatids with the same sequence break apart at and are exchanged in a process known as genetic recombination or "crossing-over". Recombination exchanges genetic material between homologous chromosomes and increases the genetic variability of the offspring. This exchange produces a chiasma, a region that is shaped like an X, where the two chromosomes are physically joined.
Synapses: targets for Alzheimer's: these communication junctions between brain cells bear the brunt of AD, but you can help protect them.
Aug 01, 2010; It is becoming increasingly clear that Alzheimer's disease (AD) is a disease of the brain's synapses, the communication points...