Chiasma (genetics) In genetics, a chiasma (pl. chiasmata) is the point of contact, the physical link, between two (non-sister) chromatids belonging to homologous chromosomes. At a given chiasma, an exchange of genetic material can occur between both chromatids, what is called a chromosomal crossover, but this is much more frequent during meiosis than mitosis. In meiosis, absence of a chiasma usually result in improper chromosomal segregation and aneuploidy.
For example, certain kinds of breast cancers are insulin sensitive, and thus eating a lot of carbohydrates (ironically like in a vegan diet) would cause your body to produce lots of insulin, making this an inefficacious strategy in reducing risk for those particular kinds of cancer.
To get the full benefit of a vegan diet, vegans should do one of the following: 1  Eat fortified foods two or three times a day to get at least three micrograms (mcg or Âµg) of B12 a day or. 2  Take one B12 supplement daily providing at least 10 micrograms or. 3  Take a weekly B12 supplement providing at least 2000 micrograms.