Molecular Evidence of Evolution

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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NGSS.HS-LS4-1

When you compare DNA or proteins to support evolution, you are using what kind of evidence?

• anatomical evidence
• molecular evidence
• fossil evidence

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NGSS.HS-LS4-1

Two organisms that are closely related would have

• very similar DNA sequence
• exactly the same DNA sequences
• no proteins in common
• completely different DNA sequence

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If two organisms have similar traits of DNA they probably share a common...

• ancestor

• environment

• population

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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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NGSS.MS-LS4-2

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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True or False: Species are more closely related if they have a more recent common ancestor.

• True

• False

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NGSS.HS-LS4-1

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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NGSS.HS-LS4-1

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The DNA of most organisms is coiled around histone proteins

• comparing embryos

• biochemical/molecular evidence

• comparing anatomy

• analogous structures

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The change over time in a species/population over time

• evolution

• natural selection

• variation
• adaptation

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