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31 December, 18:22

The only source of new brand new genetic variation in a species is:

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  1. 31 December, 18:35
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    The three sources of genetic variability in a sexually reproducing organism are: Independent assortment of homologous chromosomes during meiosis I and of nonidentical sister chromatids during meiosis II. Crossing over between homologous chromosomes during prophase I. Random fertilization of an ovum by a sperm.
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