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AP®︎/College Biology

Lesson 8: Speciation

Speciation

AP.BIO: EVO‑3 (EU), EVO‑3.D (LO), EVO‑3.D.2 (EK), EVO‑3.E (LO), EVO‑3.E.2 (EK), EVO‑3.F (LO), EVO‑3.F.2 (EK), EVO‑3.F.3 (EK)

Which of the following describes two species that exhibit a prezygotic mechanism of reproductive isolation?

(Choice A)
The yellow-bellied toad (Bombina variegata) and the fire-bellied toad (B. bombina) have overlapping geographic ranges, but hybrids between the two species have high rates of embryonic mortality.
(Choice B)
The rice species Oryza sativa and O. glaberrima can be crossed to produce F1 hybrid plants, but these hybrid plants produce empty pollen grains that cannot carry out fertilization.
(Choice C)
The western spotted skunk (Spilogale gracilis) and the eastern spotted skunk (S. putorius) have overlapping geographic ranges, but S. gracilis mates in late summer and S. putorius mates in late winter.
(Choice D)
The domesticated horse (Equus ferus caballus) and the domesticated donkey (Equus africanus asinus) can mate and produce offspring which are healthy, but sterile.

Stuck?