Odyssey of Life, Part I—The Ultimate Journey
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Student Handout |
Timing is Everything
Can you tell a chicken from a fish? How about a human from a pig? Sure you can, you say. Chickens have wings,
fish have fins, humans have arms and pigs have hoofs. But what about when they are just starting to form?
The drawings below represent three developmental stages of five different animals. They have been all mixed up—see if you can tell what's what.
Procedure
Cut out the squares and see
if you can correctly match the embryos with the animals,
placing them in order from earliest to latest stages of development. Make a chart like the one below
to organize the squares. When you are done, write an
explanation of why you ordered the drawings the way you did. What are some similarities among the drawings? What are some
differences? What, if any, patterns do you see as you go from stage 1 to stage 3?
Make a chart like this one for your answers:
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fish |
chick |
pig |
calf |
human |
stage 1 |
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stage 2 |
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stage 3 |
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