My findings of a homologous and an analogous structure between the human, the bat/bird, and the whale:
1a) A whale’s fin and a human’s hand share the same bones in
their “arms” though they are used for slightly different uses, whales swimming,
humans for everyday activities.
1b) The fin on a whale and the arm of a human consist of the
same bones though one creature may have bigger ones. The fin has bigger bones
and no fingers because to evolve in the water the whale had to learn how to
swim and the human needed to evolve in a way that allowed the use of the
fingers to pick things up and adapt the their environment. Not to mention
typing, like how I am right now.
1c) From my research, the whale and human common ancestor
was the bear. Bears that found no need for their legs turned into whales while
after time the bear learned to be human. They all originate from a mammal
before them, but over time changed to what they are today. (Source: http://au.answers.yahoo.com/question/index?qid=20110301215429AATeEBm)
1d)
2b) The similarity is that of the whale and the human,
except the bones structure is different in that a bat or birds bones must be
light enough to allow them to lift themselves off the ground to fly. Their bone
structure is also made so that the “fingers” are longer to allow the wings to
grow in and become functional.
2c) I think that these two did share a common ancestor, but
they didn’t become as close in evolution making them completely two different creatures.
2d)
Great pairing of homologus traits and good explanation of differences in function/structure arising from different environments. Good images.
ReplyDeleteThe bear is not the common ancestor of humans and whales (not thrilled with your source, by the way... note that answer had 0 votes. Keep those sources science-based). The crucial issue to understand is that since both of these species are mammals, the common ancestor was also a mammal and all mammals share this common limb structure, which they inherited from reptiles, who in turn inherited it from amphibians.
Your analogous trait is actually a homologous trait, very similar in fact to your first pair. Bats and humans are both mammals and inherited their limb structure from a common mammalian ancestor, i.e., the commonalities are inherited, and the differences arose out of different environmental pressures. That is the definition of homologs.
Make sure your review the analogous traits. Keep in mind that an analogous example from the assignment background was the bat and the bird, with the wing structure arising independently in each through parallel evolution.
I learned a lot from your post. Who knew that us humans shared a trait with the whale, in which we have a common ancestor with!
ReplyDeleteI understood that we humans have similar bone structures as whales bats birds and even bears and there was also a lot of evolving involved because bears turned into whales and at one point bears learned to be humans.
ReplyDeletethank you
ReplyDelete