What helps ensure the survive of a species?
Genetic variation. It is this variation the is the significance of evolution. Without genetic differences among individuals, "survival of the fittest" would certainly not it is in likely. Either every survive, or all perish.
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During prophase I, chromosomes condense and also become visible inside the nucleus. Together the atom envelope starts to rest down, homologous chromosomes relocate closer together. The synaptonemal complex, a lattice that proteins between the homologous chromosomes, forms at certain locations, spreading to cover the whole length of the chromosomes. The chop pairing the the homologous chromosomes is dubbed synapsis. In synapsis, the genes on the chromatids that the homologous chromosomes room aligned with each other. The synaptonemal facility also supports the exchange that chromosomal segments between non-sister homologous chromatids in a process called crossing over. The crossover occasions are the very first source of genetic variation developed by meiosis. A single crossover event in between homologous non-sister chromatids leads to an exchange the DNA between chromosomes. Adhering to crossover, the synaptonemal facility breaks down and the cohesin connection in between homologous bag is also removed. At the end of prophase I, the bag are hosted together just at the chiasmata; lock are called tetrads since the four sister chromatids of every pair of homologous chromosomes are now visible.
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