Say whether each pair of organs is homologous or analogous…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Say whether each pair of organs is homologous or analogous.
- The forelimb of a whale and the forelimb of a bat.
- The wing of a butterfly and the wing of a bird.
- The thorn of Bougainvillea and the tendril of Cucurbita.
- The tuber of a potato and the tuber of a sweet potato.
- The eye of an octopus and the eye of a human.
- The flipper of a penguin and the flipper of a dolphin.
Need a reminder? The key ideaShow
Homologous organs have the same origin and different jobs (divergent evolution). Analogous organs have the same job and different origins (convergent evolution). Deeper rock layers are older. Radioactive carbon halves every years, so after half-lives is left.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Homologous. Both are forelimbs with the same bones.
Step 2. (b) Analogous. Both fly, but the butterfly wing is a flap of the body wall and the bird wing is a forelimb.
Step 3. (c) Homologous. Both are modified shoots. One became a thorn and one became a tendril.
Step 4. (d) Analogous. The potato tuber is a stem and the sweet potato tuber is a root. Both store food.
Step 5. (e) Analogous. Both see, but the eyes arose separately in different groups.
Step 6. (f) Analogous. Both swim, but the penguin is a bird and the dolphin is a mammal.
Answer: (a) homologous; (b) analogous; (c) homologous; (d) analogous; (e) analogous; (f) analogous.
Discussion (0)
Log in to join the discussion.
Loading…