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Flashcards · Biology · Evolution and Natural Selection

The Pentadactyl Limb

16 cards

  1. What is a pentadactyl limb?

    A limb with five digits and a common pattern of bones.

  2. Name the bone in the upper limb.

    The humerus.

  3. Name the two bones in the lower limb.

    The radius and the ulna.

  4. What are the bones of the wrist called?

    Carpals.

  5. What are the bones of the fingers called?

    Phalanges (digits).

  6. Name four animals with a pentadactyl limb.

    Human, bat, whale and horse.

  7. What is the function of a bat's wing?

    Flying.

  8. What is the function of a whale's flipper?

    Swimming.

  9. What does the same pattern of bones suggest?

    That the animals share a common ancestor.

  10. What has changed the limbs for different functions?

    Natural selection.

  11. What is a homologous structure?

    A structure with the same arrangement of parts, but possibly a different function.

  12. What is an analogous structure?

    A structure with the same function but a different origin, such as the wings of a bird and an insect.

  13. Are insect and bird wings homologous?

    No. They are analogous.

  14. Why is the horse leg adapted for running?

    It is long with few digits, ending in a hoof.

  15. What is divergent evolution?

    Related species evolving different features from a common ancestor.

  16. Common mistake about the pentadactyl limb?

    Saying the animals evolved from each other. They share a common ancestor.