A: The two species I found to have the homologus trait is the frog and the rabbit. Frogs are amphibians that can not only live on land but also in water.They are known for their extremely long hind legs that make it so they can make incredibly long leaps. They only procreate in water and have very smooth skin. Rabbits are mammals that strictly live on land. Most people keep them as pets and kids in agriculture use them in competitions. They have large teeth and are very fluffy. Small fun fact people believe that rabbit's feet are lucky. Their long legs make them very agile. Rabbits had to adapt to be fast to outrun predators. The homologous trait they share is the humerus bone.
B: These animals are homologous due to their common ancestor the Eusthenopteron. The Eusthenopteron is an extinct lobe fish that gave the rabbit and frog their common trait. Both these animals may share this common trait but, like I explained before they use it in different ways. The frog uses it to swim fast and jump long distances while the rabbit uses it primarily for speed to outrun its predators. Both these animals tend to use their humerus's regularly whether it be for jumping or hopping or even attacking and outrunning prey. These animals rely on the use of this common trait.
C: By having the common ancestor that they do it supports my claim that they are homologous. With the finding of the fossils of the Eusthenopteron they have found that the humerus bone structure is identical in all of the animals I have talked about. That is how you prove they are homologus.
D:
A: The two animals I think fit into the analogus category is the duck and the platypus. The duck would be labeled as an awautic bird and the platypus is a mammal. The similarities I have found are the bills and their webbed feet. Both live on land and tend to thrive in water. Their bills help with getting food and the webbed feet assist in swimming.
B: As I have previously stated the analogus trait they share are their bills and webbed feet. Both these animals use these traits in the same way. The bill assists with gathering food and filtering out waste whole the webbed feet assist in swimming.
C: What makes them analogus is the fact that they share no common ancestor. The platypus actually strayed from any lineage that would have connected them to ducks. Ducks are aquatic birds and platypus's are mammals.
B: These animals are homologous due to their common ancestor the Eusthenopteron. The Eusthenopteron is an extinct lobe fish that gave the rabbit and frog their common trait. Both these animals may share this common trait but, like I explained before they use it in different ways. The frog uses it to swim fast and jump long distances while the rabbit uses it primarily for speed to outrun its predators. Both these animals tend to use their humerus's regularly whether it be for jumping or hopping or even attacking and outrunning prey. These animals rely on the use of this common trait.
C: By having the common ancestor that they do it supports my claim that they are homologous. With the finding of the fossils of the Eusthenopteron they have found that the humerus bone structure is identical in all of the animals I have talked about. That is how you prove they are homologus.
D:
A: The two animals I think fit into the analogus category is the duck and the platypus. The duck would be labeled as an awautic bird and the platypus is a mammal. The similarities I have found are the bills and their webbed feet. Both live on land and tend to thrive in water. Their bills help with getting food and the webbed feet assist in swimming.
B: As I have previously stated the analogus trait they share are their bills and webbed feet. Both these animals use these traits in the same way. The bill assists with gathering food and filtering out waste whole the webbed feet assist in swimming.
C: What makes them analogus is the fact that they share no common ancestor. The platypus actually strayed from any lineage that would have connected them to ducks. Ducks are aquatic birds and platypus's are mammals.
Hey -- This is a well done blog post. I like the examples you picked between Homologous and Analogous adapted traits. I like the way that you were able to trace the rabbit and the frog back the common ancestor. Those are species that I would not think of having a common ancestor. One piece of feedback is that the image of the frog does not load.
ReplyDeleteThe platypus and the duck are another two that were very interesting to me. They are species that I would have expected more closely related but turns out they are not.
This was overall a good analysis. Good work on this blog post!
After reading your post I learned that frogs and rabbits have a lot more in common than I expected. That humerus bone shows up in a lot of animals, but I had no idea how specifically rabbits and frogs shared a homologous trait that shows they are related. As for the duck and platypus, I wrote about the same animals for my own analogous trait example. Strange connection between the two which have so many similarities, but at the same time understandable that the platypus shows no relation to the duck.
ReplyDeleteThank you for offering an alternative view for your homologous trait, I think it was much more interesting than my own.
Homology: Good opening description.
ReplyDelete"These animals are homologous due to their common ancestor the Eusthenopteron."
Animals aren't homologous. They can share homologous *traits* but they themselves cannot be homologous or analogous with other animals. This is an important distinction.
Note: I had to search around to find where you identify the actual homologous trait in question. I found it at the end of the first paragraph. It would have been appropriate to include it at the beginning of the second paragraph where you are asked to describe the structural and functional differences in that trait.
You do a good job of explaining the *functional* differences between the humerus of the rabbit and frog but how is that reflected in the *structural* differences in the humerus of each organism? To understand how convergent evolution produced this homologous pair of structures, we need to understand both the functional and the structural differences involved here.
It's true that Eusthenopteron possessed that early skeletal limb structure but do we need to go back that far to find the common ancestor? Rabbits are mammals, who arose from reptiles, who arose from amphibians. Since frogs are also amphibians, we can conclude that the common ancestor was an archaic amphibian. We also know from the fossil record that early amphibians possessed that generalized mammalian limb structure and passed that onto these two descendant species, with changes concurring over time due to differences in the environment (aquatic vs. terrestrial). That is what we need to know to confirm common genetic origin and confirm homology.
Analogy: This opening section could have been expanded. The idea here was to provide a description of these two species to provide your readers with a better foundation of understanding for these comparisons.
The guidelines for the second section ask you to pick just one trait and describe the similarities in both structure and function, tying those in with similarities in environmental pressures that produced the convergent evolution to create these traits. You have two traits listed here. Both are analogous traits, but you needed to just take one and expand upon it further.
"What makes them analogus is the fact that they share no common ancestor."
No, what makes these traits analogous (bills or webbed feet) is that the *traits* didn't arise from a common ancestor. The organisms DO share a common ancestor. The question at hand is whether the traits you are discussing (bills or webbed feet) arose from that common ancestor or arose from independent evolution. So how do we use ancestry to confirm that these traits are analogous?
For example, I'll use the bill structure: The platypus is a mammal, which arose from reptiles. The duck is water fowl, who arose from birds in general, who arose from reptiles. From that, we know that the common ancestor was an archaic reptile. With very rare exceptions, reptiles do not have beaks, so that suggests that these traits are analogous. But we can look at this further and recognize that water fowl evolved the bill trait after birds arose from reptiles, when water fowl broke off from other birds. Likewise, mammals do not possess bills, so the trait the platypus is a derived trait, evolved independently when the organism split off of the mammalian clade. So in both cases, the bill structure arose independently in these two species. The trait was not inherited from that common ancestor. That is the information we need to confirm analogy.
Good images.
After reading your blog post it very obvious that you did a thorough research on the homology part of the assignment, with more background information on the chosen species shared lineage, but the same isn't true with the analogous part. With that said, it's not wrong or really lacking on key points. But it is noticeable,
ReplyDeleteWith that said I also did ducks and platypus for analogous, and pretty much said the same amount or less then you did in terms of description. So take what I say with a grain of salt