A large assemblage of land snails is subdivided into two populations (A and B) by a river that effectively isolates the two populations for an indefinitely long period. From an evolutionary standpoint, which of the following is the LEAST likely to occur in the two populations
(A) Population A and B will eventually differ in their ecological requirements
(B) Population A may ultimately breed at a different time of the year than population B does
(C) Population A may undergo instantaneous speciation by the doubling of its chromosome numbers (polyploidy)
(D) Under laboratory conditions, cross fertilization between members of the two populations may be successful even after a long period of geographical separation
(E) The two populations may become morphologically very dissimilar
Answer: C
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AP Biology
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