There is a population of frogs living in a pond, 25 are green, 25 are brown, 25 are yellow with green spots and 25 are all yellow. A drought occurred and 75% of the frogs died. The remaining frogs were green and brown, after 25 generations the frogs still were green and brown, yellow frogs never appeared in the population again. Which of the following best explains this phenomenon?
A. Balancing selection.
B. Founder effect.
C. Bottleneck effect.
D. Sexual selection.
E. Heterozygote advantage.
Answer: C
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