The Graph Below Shows Results of Two Simulations, Both Depicting

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The graph below shows results of two simulations, both depicting the rise in frequency of a beneficial allele in a population of infinite size. The selection coefficient and the starting frequency are the same, but in one simulation the beneficial allele is dominant and in the other it is recessive. Neither allele is fixed by 500 generations. (a) Which simulation shows results for a dominant and which shows results for a recessive allele? How can you tell?
(b) Neither of the alleles reaches fixation by 500 generations. If given enough time, will both of these alleles reach fixation in the population? Why or why not?