ET Molecular evidence for evolution 2/27/24

The base sequence in the DNA of chimpanzees and humans is 99% similar. What type of evidence for evolution is this?

• molecular evidence

• comparing anatomy

• comparing embryos

• fossil evidence

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The amino acid sequence for a protein was compared between three species. Species A and B had 2 differences, Species A and C had 6 difference, & Species B and C had 4 differences. Which species are most closely related?

• A and B

• A and C

• B and C

• All species are equally related

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This table shows the number of differences in amino acids of a protein when compared to humans. Which species is LEAST closely related to humans?

• Chimpanzee

• Fruit fly

• Horse

• Pigeon

• Rattlesnake

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Why does more similar DNA between two species indicate a more recent common ancestor?

• DNA mutations decrease over time

• DNA mutations increase over time

• DNA does not mutate

• Similar DNA does NOT indicate a more recent common ancestor

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Why can similarities in amino acid sequences be used to determine species relatedness?

• You are born with all of you amino acids

• amino acids control which DNA is used to build you

• DNA codes for amino acid sequences, so similar amino acid sequences indicate similar DNA

• amino acids cannot provide valid data on species relatedness

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The tail bone, wisdom teeth, and appendix are all parts of the human anatomy that would be considered...

• homologous structures

• vestigial structures

• fossils

• extinct

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