Evidence of Evolution

AP Biology· difficulty 2/5

Embryos of vertebrates (fish, chicken, human) look surprisingly similar in early stages. This is evidence for

  • A

    Lamarckian inheritance — early developmental traits are acquired anew each generation

  • B

    Convergent evolution — unrelated vertebrate lineages arrived at similar embryos independently

  • C

    Common ancestry — early developmental programs are conserved across vertebrates

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  • D

    Strict recapitulation — every embryo replays its full adult ancestry stage by stage

Explanation

Conservation of early developmental gene networks (e.g., Hox genes) reflects shared ancestry.

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