What help ensure the survival of a species?
Genetic variation. That is this variation that is the essence of evolution. Without genetic differences amongst individuals, "survival of the fittest" would not be 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 nuclear envelope starts to rest down, homologous chromosomes move closer together. The synaptonemal complex, a lattice that proteins between the homologous chromosomes, creates at details locations, dispersing to sheathe the entire length of the chromosomes. The chop pairing of the homologous chromosomes is dubbed synapsis. In synapsis, the genes on the chromatids of the homologous chromosomes room aligned v each other. The synaptonemal complicated also support the exchange of chromosomal segments in between non-sister homologous chromatids in a procedure called crossing over. The crossover occasions are the very first source of hereditary variation developed by meiosis. A solitary crossover event in between homologous non-sister chromatids leads to an exchange that DNA between chromosomes. Complying with crossover, the synaptonemal facility breaks down and also the cohesin connection between homologous bag is additionally removed. In ~ the finish of prophase I, the pairs are organized together only at the chiasmata; lock are dubbed tetrads because the four sister chromatids of each pair the homologous chromosomes are now visible.
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