What helps ensure the survival of a species?

Genetic variation. It is this variation that is the essence of evolution. Without hereditary distinctions among individuals, "survival of the fittest" would certainly not be most likely. Either all survive, or all perish.

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api/deki/files/18054/517px-Chromosomal_Recombination.svg.png?revision=1&size=bestfit&width=409&height=264" />Figure (PageIndex2):​​​​​ ​​Crossing-over. A maternal strand of DNA is displayed in red. A paternal strand of DNA is displayed in blue. Crossing over produces 2 chromosomes that have actually not previously existed. The procedure of recombination entails the breakage and rejoining of parental chromosomes (M, F). This results in the generation of novel chromosomes (C1, C2) that share DNA from both parents.

During prophase I, chromosomes condense and become visible inside the nucleus. As the nuclear envelope starts to break dvery own, homologous chromosomes move closer together. The synaptonemal complicated, a lattice of proteins between the homologous chromosomes, creates at specific places, spanalysis to cover the whole length of the chromosomes. The tight pairing of the homologous chromosomes is called synapsis. In synapsis, the genes on the chromatids of the homologous chromosomes are aligned via each various other. The synaptonemal complex also supports the exreadjust of chromosomal segments between non-sister homologous chromatids in a process dubbed crossing over. The crossover events are the initially resource of genetic variation produced by meiosis. A single crossover event between homologous non-sister chromatids leads to an exadjust of DNA in between chromosomes. Following crossover, the synaptonemal complicated breaks dvery own and the cohesin link between homologous pairs is additionally removed. At the finish of prophase I, the pairs are hosted together just at the chiasmata; they are referred to as tetrads because the four sister chromatids of each pair of homologous chromosomes are now visible.

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non sister chromatids of tetrad exreadjusted their genetic materialhow does meiosis create genetic diversity