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     EduGorilla 
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    A new species is formed when

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    1. an individual with a new genotype is formed due to exchange of chromosome segments during crossing - over in gametogenesis

    2. genotypic changes accumulate in a population resulting in its reproductive isolation

    3. variants with new phenotypes are produced due to new combinations of genes during reproduction

    4. homologous chromosome exchange segments during crossing over in gametogenesis.

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