difference in shell size and shape prevents most mating attempts between snails from the two kinds of ponds. Which statement summarizes what is happening in this example? In sympatry, behavioural isolation evolved through gene flow In allopatry, natural selection caused the evolution of post-zygotic barriers In sympatry, behavioural isolation evolved through genetic drift O In allopatry, mechanical isolation evolved as a by-product of natural selection

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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A species of freshwater snail is introduced to many ponds on an island. In ponds with
crayfish (a snail predator), the snails evolved a larger and more globular shell than in
ponds without crayfish. In an experiment, a grad student puts together snails from
both types of ponds and carefully records their mating attempts. She finds that the
difference in shell size and shape prevents most mating attempts between snails
from the two kinds of ponds. Which statement summarizes what is happening in this
example?
In sympatry, behavioural isolation evolved through gene flow
In allopatry, natural selection caused the evolution of post-zygotic barriers
In sympatry, behavioural isolation evolved through genetic drift
In allopatry, mechanical isolation evolved as a by-product of natural selection
Transcribed Image Text:A species of freshwater snail is introduced to many ponds on an island. In ponds with crayfish (a snail predator), the snails evolved a larger and more globular shell than in ponds without crayfish. In an experiment, a grad student puts together snails from both types of ponds and carefully records their mating attempts. She finds that the difference in shell size and shape prevents most mating attempts between snails from the two kinds of ponds. Which statement summarizes what is happening in this example? In sympatry, behavioural isolation evolved through gene flow In allopatry, natural selection caused the evolution of post-zygotic barriers In sympatry, behavioural isolation evolved through genetic drift In allopatry, mechanical isolation evolved as a by-product of natural selection
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