Unformatted text preview: 06.1. If there is NO VARIATION in shell thickness within a population of snails, and no
mutations occur what happens to shell thickness in response to crab predation?
all sreals in the population grow theker shells.
Some snails in the population evolve thicker shells.
(3 The average shell thickness evolves to be much thicker over several generations
There is no change in shel thickness within the population
06.2. If there Is NO SELECTIVE SURVIVAL based on shell thickness within a population
of snails, what happens to shell thickness in response to crab predation?
The average shell thickness increases within each generation, but there is no change in shell
Lochness from generation to generation
There is tireduon by natural selection of shell thickness, and average shell thickness increases
There may be evolution of shell thickness, but not through natural selection and not necessarly
Toward thicker shells
There is no change in shell thickness within the population
06.3. if mutations arise that affect shell thickness within a small population, then with
crabs present, those mutations;
. Willresult in offspring having thicker shels thin their parents
Will result in offspring having thicker of thinner she's than ther parents
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- Fall '19
- shell thickness