Trait Variations

A slight difference in an inherited trait between individual members of the same species.

• variations

• adapatations

• homologous structures

• analogous structures

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The discovery of DNA and genes proved that

• Darwin was wrong

• mutations create variations and come from genes

• we are all the same species

• bats and butterflies have a very close common ancestor

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When an organism of a species is born with a variation in a trait that gives it an advantage in its environment, we call that trait an adaptation.

• true

• false

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These cause variations.

• mutations

• adaptations

• a desire to change

• injuries

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What is it called when humans decide which traits of an organism are the most desirable and only allow those organisms with the specific, desired traits to breed.

• biological evolution

• evolution by natural selection

• artificial selection

• inbreeding

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Why are advantageous traits more likely to be passed onto offspring?

• Because they are more likely to survive and reproduce.

• Because they come from dominant alleles.

• Because they come from recessive alleles.

• Because the trait is an acquired phenotype.

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If a new trait DOES help an organism survive, what may happen to it?

• It dies and its DNA is not passed on

• It survives and its DNA is passed on

• It changes its traits to adapt and survive

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If a new trait DOES NOT help an organism survive, what may happen to it?

• It dies and its DNA is not passed on

• It survives and its DNA is passed on

• It changes its traits to adapt and survive

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What happens to new traits that HELP organisms survive over time?

• They become MORE COMMON

• They become LESS COMMON

• They are EQUALLY COMMON

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The differences among a species, like different bird beaks, are called

• genes.

• variations.

• traits.

• theories.

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