The most powerful approach to isolating a single mutant from a population of billions is positive selection.
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Both of these daughter cells will then go on to divide once more in meiosis II, producing 4 daughter cells, 2 with n+1 and 2 with n-1. Nondisjunction in meiosis II results from the failure of the sister chromatids to separate during anaphase II.
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I believe A. Nitrogen is the most abundant Gas.
