7A Common Ancestry

The five species illustrated most likely have

similar limb structures because they all -

• share a common ancestor

• use their limbs for the same functions

• occupy the same level on the food pyramid

• adapted to the same environmental conditions

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Which information would best help scientists verify the relationships among the organisms shown above?

• The organisms’ nutritional requirements

• The organisms’ DNA sequences

• The organisms’ migratory patterns

• The organisms’ population sizes

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Which process most contributes to genetic variation in a population?

• crossing over during meiosis

• chromosome replication during mitosis

• cytokinesis during cellular division

• duplication of chromosomes in asexual reproduction

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The diagram illustrates an embryonic stage of two organisms. Which of the following can be determined by observing the embryos shown in the diagrams?

• The organisms share a common ancestry

• The organisms belong to the same genus

• The organisms are native to the same geographic areas

• The organisms will grow into anatomically similar adults

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NGSS.HS-LS4-1

Which evidence of common ancestry is being studied in this visual?

• biogeography
• fossil record
• anatomical homology
• molecular homology

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NGSS.HS-LS4-1

Which evidence of common ancestry is being studied in this visual?

• biogeography
• fossil record
• anatomical homology

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NGSS.HS-LS4-1

Which evidence of common ancestry is being studied in this visual?

• biogeography
• fossil record
• anatomical homology

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NGSS.HS-LS4-1

Scientists compare the limbs of organisms to look for evidence of common ancestry. These limbs provide evidence of common ancestry because they -

• perform the same function
• are the same size
• have the same basic structure
• are parts of the same animal

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NGSS.HS-LS4-1

Which evidence of common ancestry is being studied in this visual?

• developmental homology
• molecular homology
• anatomical homology

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NGSS.HS-LS4-1

The similarities among early stages of the embryos provide evidence that -

• these organisms evolved from a common ancestor
• the organisms all retained their gills and tails
• the organisms belong to the same species

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