1.
A. A
lizard and a bird. The both came from an common ancestor.
B. The
first tetrapod, had limbs with one long bone (the humorous) attached to two
other long bones (the radius and ulna). Both of them inherited the tetrapod
limb. A lizard’s tetrapod limb is used to help with walking or running. Its
bones are much shorter then a birds bones. A birds tetrapod limb helps it fly.
It is used in the bird’s wings which has much longer bones than that of a lizard.
The differences between the two species evolved over time to adapt to their environments
to survive. Although they all kept the same type of bone structure.
C. The
common ancestor was known as the tetrapod which was actually the first
tetrapod. The ancestor had this trait in its legs and arms, although the trait
may not look the same due to it being my shorter and much thicker, was a direct
relation to them.
D.
2.
A. Butterflies
and Birds
B. In both of these they had wings. In which they
both experience multiple differences and similarities. The wings of butterflies
have scales while the wings of birds have feathers. They both adapted to life
in the air so they evolved wings.
C. Birds com
from the ancestor of dinosaurs. It is said to be a maniraptoran in which did
not have wings. The common ancestor of a butterfly is said to be the moth. Relating
to the butterfly mainly because it did fly and it did have wings.
D.
I found your example of homology extremely interesting. However, for your analogy example (though this is indeed an excellent example of analogy), you gave each species a different common ancestor. A "common" ancestor must be common to both species. What I found from my brief research on the subject, the common ancestor is not known for these two species. However, we know that they are analogous because both the arthropod which the butterfly evolved from and the reptile the bird evolved from had no wings, and so they could not have received their wings from a common ancestor, whatever that ancestor may be.
ReplyDeleteYour findings are very interesting. Its so cool to find out that two different types of species can have structures in common., but they don't look alike at all. I also like that you included a picture of how the evolution happen. I also used the butterfly and bird example too.
ReplyDeleteGood comparison for your homologous trait, particularly the discussion of the skeletal anatomy (one correction: the upper limb bone is called the "humerus"). The common ancestor did not need to be the "first" tetrapod, mainly because birds arose from reptiles long after reptiles (in fact, dinosaurs) arose, and the first tetrapods were amphibians. But understanding that they both arose from early reptiles is sufficient to recognize that these are homologous traits.
ReplyDeleteGood analogous comparison, but the question of common ancestry remains. Did the wings arise independently in each organism of from the common ancestor of these two species some 100's of millions of years ago? Since we know that birds developed wings independently when they branched off from dinosaurs, we can conclude that the traits are analogs, not homologs.
Other than this point, good post.