7. If there is no heritability for shell thickness within a population of snails

Question

7. If there is no heritability for shell thickness within a population of snails, what happens to shell thickness in response to crab predation?

a. The average shell thickness increases in each generation, but not in the next generation.

b. There is evolution by natural selection of shell thickness, and average shell thickness increases every generation.

c. There is evolution of shell thickness, but not through natural selection.

d. There is no significant change in shell thickness within a population.

Explanation / Answer

If there is no heritability for shell thickness within a population of snails, The average shell thickness increases in each generation in response to crab, but not in the next generation.

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