a. Briefly describe the two different species that possess the homologus trait.
Two different species that posses the homologous trait are bats and humans. Both bats and human have similar arm structure.
b. Describe the homologus trait of each species, focusing on the differences in structure and
function of the trait. Why do these homologus traits exhibit differences between the two
species? Make sure your explanation is clear and complete.
Humans and bats have the exact same bones in their forearm, but are used for different functions. Bats use their forearms to fly around and move from place to place. On the other hand, humans use their forearms for grip, anything humans want to pick up, hold, or take they use their forearm.
c. Who was (generally, not specifically) the common ancestor of these two species and how do
you know that ancestor possessed this homologus trait?
The common ancestor they both share is the fact that they have similar forearms bones, like the humerus, ulna, radius, carpals, metacarpals, and phalanges.
2. For your analogous traits provide the following information
a. Briefly describe the two different species that possess the analogous trait.
The sharks and dolphins are two different species that possess the analogous trait.
b. Describe the analogous trait of each species, focusing on the similarities in structure and function of the trait. Clearly explain why these analogous traits exhibit similarities between the two species.
Even though sharks are cold-blooded creature and dolphins are mammal, they share similarities in structure and function. Both sharks and dolphins share similar structure, which are similar body shape, they have fins and flippers. They both have a similar environment living underwater and use their body structure to swim faster to catch their prey.
c. All pairs of organisms share some common ancestor if you go back far enough in time. Did
the common ancestor of these two species possess this analogous trait? Why or why not?
Dolphins and sharks come from a related organism named lamprey .
Good description on your homologous trait. With regard to ancestry, you needed to actually discuss the possible common ancestor, not just the trait. In this case, since both organisms are mammals, we know that their ancestor was also a mammal. Early mammals possessed this ancestral limb structure (which they inherited from their reptilian ancestors), so we know that these modern limb structures are genetically related and therefore homologous.
ReplyDeleteGood opening discussion on your analogous trait. With regard to ancestry, we do know that the common ancestor of these two distantly related organisms was an ancient fish that likely possessed the structures you are discussing. I'm not sure if it was an ancient lamprey or not, but the key is that it was a fish with a fish-like structure. So if the common ancestor possessed these traits, why aren't these considered to be homologs? That needed to be addressed here.
Good post Jose I also did an analogous trait comparison of dolphins and sharks. Isn’t it interesting that bat wings are so closely related to human arm and hand? If it weren’t for this class I’m not sure many of us would know something like that. I also would not have known that the human neck was so closely related to the neck of a giraffe, the only difference being elongated vertebrae. I’m very interested in what comes next in evolution later on down the line.
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