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How does crossing over lead to genetic variation ?

Sagot :

Genetic data is transferred between homologous chromosomes during crossing over. Through this exchange, novel gene combinations are formed, increasing the genetic diversity of the progeny.

Homologous chromosomes (one from each parent) pair along their lengths during meiosis. Chiasma points are where the chromosomes cross. The chromosomes split and reassemble at each chiasma, swapping some of their genes. Genetic variety is produced by this recombination. The exchange of genetic material between non-sister chromatids of homologous chromosomes, or crossing-over, takes place during prophase I. Remember that homologous chromosomes align in pairs, gene for gene down their whole length, generating a configuration with four chromatids known as a tetrad during prophase I.

A new mix of genetic data for the cell for a particular trait results from crossing over. By crossing over, organisms are prevented from being genetically identical from generation to generation. Variations in the genetic material that is passed down through the generations are made possible via genetic recombination. To boost genetic variety, chromosomes that are similar to one another cross across. A piece of one chromosome is swapped for another during crossing over. A hybrid chromosome with a distinctive genetic material pattern is the end outcome.

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