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What caused the newt population to become more poisonous?

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How did the trait for increased poison level become more common in the newt population?

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Why do populations change over time?

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A group of the same type of organism living in the same area

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A characteristic that all members of a species have, which varies between organisms

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A specific characteristic of an individual organism

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A visual representation used to summarize variation and distribution in a population

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The number of individuals with each trait in a population

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Any difference in traits between individual organisms

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A group of individuals born and living at about the same time

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Everything (living and nonliving) that surrounds an organism

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A trait that makes it more likely that an individual will survive in a specific environment

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A trait that makes it less likely that an individual will survive in a specific environment

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A way of hiding by looking the same as the background

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A population can be described by the traits present and by the number of individuals who have each trait.

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The number of individuals with each trait in a population can change over time.

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Over many generations, individuals with adaptive traits become more common in a population, while individuals with non-adaptive traits become less common.

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The traits that exist in a population determine which traits can become more common over many generations.

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Whether or not a trait is adaptive depends on the environment.

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An organism produced as a result of reproduction

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A long piece of DNA that contains many genes

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An instruction for making a protein molecule

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A type of large molecule that performs important functions inside organisms

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The process by which the distribution of traits in a population changes over many generations

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Biologists analyze data about environmental conditions (the causes) to explain changes in the distribution of traits in populations (the effects).

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Genes are instructions for making protein molecules and protein molecules determine an organism’s traits.

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Individuals inherit their genes from their parents. Genes, and therefore traits, in a population are passed down from generation to generation.

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Individuals with adaptive traits are more likely to live longer and have offspring; individuals with non-adaptive traits are more likely to die without having offspring.

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How did a poison-level trait that wasn’t always present in the newt population become the most common trait?

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A random change to a gene that sometimes results in a new trait

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Mutations are changes to genes that can lead to changes to protein molecules, which can result in changes to traits.

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Mutations to genes can sometimes introduce new traits into a population.

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A new trait will only become more common in a population if it is adaptive.