 |
| a- leg of a frog b- leg of a lizard |
Lizards and frogs both being reptiles and having a similar bone structure in their legs are a great example for homologous traits. Both lizards and frogs move differently, for example, a frog jumps to move around while a lizard crawls quickly. This is due to the traits changing through evolution, having a common ancestor and passing this trait around is what gives this two reptiles the similar bone structure, however, their different habitats allowed for this significant change to occur as part of natural selection. although still unknown as to when this two amphibians separated into two different species
It is commonly known that lizards and frogs are descendants from an ancestor known as Gerobatrachus Hottoni.
Dolphins and sharks can be placed as having analogous traits, dolphins are warm- blooded and sharks are cold blooded but they still share a torpedo shaped body, dorsal fins, and side fins. One could even say they are cousins, This is likely due to adaptation to new environment from the dolphin perspective because they do not share a common ancestor, Sharks have been around dating back to 400 million years ago while dolphins date only from 20 – 25 million years ago and are descendant from a land dwelling mammal.
Great images. I laughed at the picture of the lizard in the chair, along with the picture of the dolphin with the cow. Good explanation of how lizard and frog move.
ReplyDeleteShark and dolphin do have a similar fin, so sometimes its hard to tell which one is which after seeing them in the water. This makes me question that if dolphin could jump out of the water, can sharks jump out of the water too? Could this be one of their analogous trait they share? I've never seen one jump out of the water, apart from the movies and do not know whether it is real or fake.
Yea it's been expeculated that this two might someday roam the earth, with what we have learned about evolution and the Hardy Weinberg method I think it won't be any time soon. Scary stuff tho. I wouldn't not want to be around when sharks become land animals 🙅🏻
DeleteI like your use of images they are very entertaining. I also used sharks and dolphins for the analgous comparisons. They have very similar fins and the functions are almost primarily the same. It can be hard to tell the difference between the both of them but you described it perfectly. Nice post.
ReplyDeleteYes Vivien until this class I thought sharks and dolphins were related but they do not share a common ancestor being that one has been on earth longer than the other... It just proofs how evolution works and how this two adapted very similar to the environment they share
DeleteHello Alejandra,
ReplyDeleteLOVE the pictures. They made me laugh. Lizards and frogs was a good choice and you did a great job explaining their movement. Your diagram is really cool because it shows how alike they are. I never would have thought they were as similar as they are. I also did dolphins and sharks because they are so similar in their structure. You would think they could function the same way in the water. I wonder why sharks have such a negative connotation and dolphins do not because they are literally so similar. It is interesting to think....
I think its due to dolphin attacks not being as vicious as a shark attack because of their teeth structure. In fact many people don't even know that dolphins attack humans as well.
DeleteYour images are too great! I learned a lot from your posting. I did not know that they sharks were around longer than dolphins have been. Along with that, do you happen to know if they have a common ancestor with the analogous trait?
ReplyDeletehello Hamaliya,
DeleteThank you, I had fun picking out my pictures :) ...
Sharks and dolphins do not share a common ancestor as per the definition of an analogous trait, they have adapted similarly there for they present similar structures... modern sharks come from ancient sharks while dolphins come from a terrestrial ancestor hence the fact that they need to come up to the surface for air while the shark not having lungs like us humans and dolphins does not need oxygen from the air.
Hi Alejandra,
ReplyDeleteI really enjoyed your post.Your pictures were so entertaining. The frog picture is so funny. I did sharks and dolphins as well for my post and I agree that they are so alike it is hard to tell which one is which. You described the differences between them very well.
You win with your images today! :-) Very entertaining and certainly caught the eye of your readers!
ReplyDeleteGood description of your species and very good discussion of the connection between the function and structure in these two species. You also presented a good explanation on ancestry. The only question I had was with this comment:
"...still unknown as to when this two amphibians separated into two different species."
What two amphibians are you talking about? There was one common ancestor and that line split, producing the line that led to frogs and at least one other line that led to reptiles like the lizard. So just like your great-grandfather would be one individual and two of his descendants are you and a distant second cousin. One ancestor produces two different descendants.
Okay on your description of your analogous pairing, but you needed to discuss the issue of the common ancestor. Who was the common ancestor of the shark and the dolphin? And did that ancestor possess and pass on this body shape trait to both descendants?
The common ancestor was an archaic fish, which means that with the shark being a fish itself, it did inherit this aquatic body shape from that fish ancestor. Does that make these traits homologous or just shared genetic traits? Well the answer to that depends upon how dolphins developed their aquatic shape. For dolphins, the path from that distant fishy ancestor is longer and more convoluted. Fish gave rise to amphibians (and took them onto land), which gave rise to reptiles, which gave rise to mammals, and from there, dolphins (also mammals) moved back into the water, evolving the aquatic body shape along the way. That means that dolphins did NOT inherit their body shape from that fish ancestor like the shark did. They developed that body shape independently, long after that split with sharks. That is what we need to know to confirm that these traits arose via convergent evolution, not through common descent, evidence of analogous traits.
Hello,
ReplyDeleteI enjoyed your choices of species for both homology and analogy. I really liked that you chose sharks and dolphins, I always thought they were related since they looked very similar but I learned something new. I understand that even though some species look and have some similar traits they are sometimes likely not from the same family. Thank you for your research and awesome pictures.