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During meiosis, the parts of the pair of chromosomes that cross?
When the chromosomes "cross over" during homologous recombination, what determines which parts of each homologous chromosome is passed from the other? Another quick question, I am right in saying that the cross on which happening in the first stage of meiosis, which means that genetic variation is already done even before the sperm becomes a zygote?
In during chromosomal crossing-over, the double helix of DNA is broken into two one chromatid chromatid homologous maternal and paternal, to exchange fragments from both chromatid nonsister reciprocal manner by a process known as genetic recombination. The consequences of each event switching can be observed microscopically at the last stages of prophase I when the chromosomes are highly condensed bivalents. At this stage, sister chromatids are tightly affixed along their entire length, and the two duplicated homologous (maternal and paternal) that are each bivalent are seen to be physically connected to specific points. Each connection, called a chiasma (plural chiasmata) is a cross between two chromatids nonsister. Each of the two chromatids of a duplicated chromosome can cross at one of the two chromatids of one chromosome of the bivalent. At this stage meiosis, each pair of duplicate counterparts is maintained by at least one chiasma. Many bivalents contain more than one chiasma, indicating that crosses multiple may occur between peers. Variation diagrams genetic link is already done even before the sperm becomes a zygote? - It's true, all gametes are different at the end of meiosis before the formation of the zygote.
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