Homologous and Analogous
Homologous:
A.
Humans and Apes share many homologous traits,
from their eyes, to their thumbs.
B. The tail bone or coccyx in Humans and the coccyx in Apes are homologous in that humans evolved from primates and eventually “lost” their tails but the tailbone is the vestigial from that evolutionary process. You can see the size difference in the picture below.
C. The best answer to the common ancestor of these two was the Homo Pan Last Common Ancestor that lived roughly 6 million years ago. I was unable to find any evidence of fossilized HPLCA but there are numerous references as the common ancestor to both Humans and Apes.
B. The tail bone or coccyx in Humans and the coccyx in Apes are homologous in that humans evolved from primates and eventually “lost” their tails but the tailbone is the vestigial from that evolutionary process. You can see the size difference in the picture below.
C. The best answer to the common ancestor of these two was the Homo Pan Last Common Ancestor that lived roughly 6 million years ago. I was unable to find any evidence of fossilized HPLCA but there are numerous references as the common ancestor to both Humans and Apes.
D.
Analogous:
A.
Two species that have Analogous traits are
Whales and Fish
B.
Both of these creatures have a body part that
puts them in motion. The Whale as the flipper, and Fish has the fins. They both
are similarly shaped and provide the different species with motion and
movement.
C.
If you go back to single celled organisms I’m
sure we all are related in one way or another. And though I haven’t found a
common ancestor by name, I researched the EVOGRAMs of Fish and Whales and found
that the common ancestor had scales and fins, but most likely air pockets to
breathe air as well.
D.
D.
Hi Justin!
ReplyDeleteI found your homologous and analogous trait interesting, and I love all the images you used! It's fascinating how something so small as a fish can have something in common with something so LARGE as a whale! Good post.
Hi Justin~ Lol! I thought your post was very informative as well as interesting. The analogous comparison with the beta fish and the whale was something I never would have thought about. Who would have thought that one so small could have something in common with one so large. Great post!
ReplyDeleteJustin
ReplyDeleteParticularly I found your post humorous. I share your view on humans and apes because of the many similarities and perhaps even the way some of us behave (kidding).
Nicely done.
A little short on your description sections for both your homologous and analogous traits. The guidelines ask you to go beyond just identification.
ReplyDeleteFor your discussion on the traits themselves, yes, I see the difference in the image. Why is that difference there? Is there a functional difference between the tailbone of the human and the gorilla? Can you tie that functional difference to some type of difference in the environmental pressures of these two organisms? Without the differences that exhibit divergent evolution, these are just a pair of shared, common traits.
You don't need to get too specific on a common ancestor. Both the gorilla and the human are apes, so we know that the common ancestor was an archaic ape. We also know that apes are tail-less, so that ancestor would have also had a sacrum and coccyx similar to what we see in your images. That would confirm that these traits were inherited via common descent. We still need to understand what differences there are and why those differences exist.
Good images.
Okay on your description of your traits in your analogous section.
On the issue of ancestry, do we need to go back to single-celled organisms to find that common ancestor? You then talk about the common ancestor having scales and fins, so you are suggesting the common ancestor was an archaic fish? That would be more on track here, but the question is, did that fishy common ancestor possess those traits in question (I'd say yes) and pass those traits onto these two modern organisms via common descent? If yes, then these are homoloogus traits. If no, then they are analogous.
As you suggest, the common ancestor of the whale and fish is an archaic fish, who did possess these fin structures and also passed that trait onto extant fish species. So the question is, did the whale also inherit it's fin from that common ancestor? Whale "fins" evolved after whales split off from terrestrial mammals, i.e., long after the split with ancient fish. This provides us with the evidence we need to confirm that this trait did evolve independently in at least one of these organisms, making these traits analogous.
Again, good images. Expand your answers. Make sure your explanations are complete. These assignments should be thought of as short papers, not tweets, complete with correct formatting, paragraphs, and full explanations. Don't be afraid to show us what you know.