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18 May, 00:03

According to the model by Case and Taper, gene flow plays a role in limiting species ranges because

a. Alleles moving into the marginal populations are adaptive for the conditions at the margins of the species range

b. Species in the edges of the range are hybridizing, and hybrids between species have lower fitness

c. Gene flow from populations at the margin of a species range to populations in the center reduces the size of populations in the margins

d. Alleles moving into the marginal populations are adaptive for the conditions at the center of the species range

e. gene flow reduces genetic variation in marginal populations

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  1. 18 May, 00:29
    0
    D,

    Explanation:

    The Alleles moving into the marginal populations are adaptive for the conditions at the center of the species range. They therefore limit the species range within the population because their genes are well expressed in the new population. And thus increases the population sizes and variation in the (while increasing the fitness) Hence, limiting species range and therefore promotes species expansion.
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