[Answer] What is a chiasmate?

Answer: where the x-shaped regions where crossing over occured

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What is a chiasmate? chiasmata vs synapsis same thing? | Student Doctor Network In Genetics what is a Chiasma? - wiseGEEK 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 generally results in improper chromosomal segregation and aneuploidy. The phenomenon of genetic chiasmata (chiasmatypie) was discovered and described in 1909 by Frans Alfons Janssens a Professor at the University of Leuven in In meiosis absence of a chiasma generally results in improper chromosomal segregation and aneuploidy. The phenomenon of genetic chiasmata (chiasmatypie) was discovered and described in 1909 by Frans Alfons Janssens a Professor at the University of Leuven in Belgium . When each tetrad which is composed of two pairs of sister chromatids begins to split the only points of contact are at the chiasmata. The chiasmata become visible during the diplotene stage of prophase I of meiosis but the actual "crossing-overs" of genetic material are thought to occur during the previous pachytene stage. Sister chromatids also form chiasmata between each other (also known as a chi structure) but because their genetic material is identical it does not cause any noticeable change in the resulting daughter cells. In humans there seems to be one chiasma per chromosome arm and in mammals the number of chromosome arms is a good predictor of the number of crossovers. Yet in humans and possibly other species evidence shows that the number of crossovers is regulated at the level of an entire chromosome and not an arm. The grasshopper Melanoplus femurrubrum was exposed to an acute dose of X-rays during each individual stage of meiosis and chiasma frequency was measured. Irradiation during the leptotene-zygotene stages of meiosis that is prior to the pachytene period in which crossover recombination occurs was found t… Read more on Wikipedia Chiasmata definition a crossing or decussation as that of the optic nerves at the base of the brain . See more. In any organism that is or behaves like a diploid chromosome pairing is important for two reasons: It insures that crossing-over -...

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