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Darwinian Snails Lab

Biology8 CardsCreated 4 months ago

This deck covers key concepts about evolution and natural selection in relation to snail shell thickness, including the effects of variability, heritability, and mutation.

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What would happen if there were no variability in shell-thickness?

There would not be a change in the distribution of shell-thickness. They would all remain the same and not evolve due to the same shell-thickness.
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Key Terms

Term
Definition
What would happen if there were no variability in shell-thickness?
There would not be a change in the distribution of shell-thickness. They would all remain the same and not evolve due to the same shell-thickness.
What would happen if shell-thickness was not heritable?
The children would not have the same shell-thickness as their parents.
Would the distribution of shell thickness in the population change over several snail generations if thickness is not heritable?
Yes. It will be random.
If survival is not selective (shell-thickness does not matter) what will happen?
Any snail will get eaten, because their shells protect them equally now.
When mutations occur, do the children look identical to each other and their parents, or are there cases where one child is different?
Majority of the children are identical, but some are different.
If a mutation occurred, is it more towards thick-shelled or thin-shelled snails or is it equally likely to happen to either?
Equally likely.
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Darwinian Snails Lab
TermDefinition
What would happen if there were no variability in shell-thickness?
There would not be a change in the distribution of shell-thickness. They would all remain the same and not evolve due to the same shell-thickness.
What would happen if shell-thickness was not heritable?
The children would not have the same shell-thickness as their parents.
Would the distribution of shell thickness in the population change over several snail generations if thickness is not heritable?
Yes. It will be random.
If survival is not selective (shell-thickness does not matter) what will happen?
Any snail will get eaten, because their shells protect them equally now.
When mutations occur, do the children look identical to each other and their parents, or are there cases where one child is different?
Majority of the children are identical, but some are different.
If a mutation occurred, is it more towards thick-shelled or thin-shelled snails or is it equally likely to happen to either?
Equally likely.
Did individual snails ever change their shell thickness or color?
No, the population changed over time as the thinner-shelled snails got eaten. That left only the thicker-shelled snails to reproduce.
What role did the predators play in causing the population of snails to evolve?
The predators determined which snails survived to reproduce.