Perissodus Are Small,scale-Eating Fish That Live in Lake Tanganyika in Africa.They

Multiple Choice

Perissodus are small,scale-eating fish that live in Lake Tanganyika in Africa.They attack larger fish from behind.The right-mouthed Perissodus attack on the left side of the larger fish and the left-mouthed Perissodus attack on the right side of the larger fish.The existence of the right-mouthed variety ensures the equally successful existence of the left-mouthed variety.This is an example of:

A) a heterozygous advantage
B) frequency dependent selection
C) genetic drift
D) sexual selection