1.For your
homologus traits provide the following information (25 pts):
a.
Briefly describe the two different species that
possess the homologus trait. (5 pts)
The two species that have homologous traits are
whales and humans. A human is a species that lives on land with two legs two
arms. A whale is a species that lives underwater and has two fins and a tail.
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. (10 pts)
The homologous traits that humans and whales have
in common are a whale’s fin and a human arm. The structure is not physically
the same, a fin is round or oval type shaped and an arm is long has a wrist and
has five fingers at the end of it. What they have in common is their skeletal
structure. Both have a radius, ulna, carpal bones, metacarpal bones, and
phalanges.
c.
Who was (generally, not specifically) the common
ancestor of these two species and how do you know that ancestor possessed this
homologus trait? (5 pts)
It is possible that whales and humans had a
common ancestry that had the same skeletal structure. It could be that whales
had legs as well but at one point lost that ability and have now fins. Humans
still need their legs to survive therefore, humans still kept their legs.
d.
Provide an image of each species in this
comparison. (5 pts)
2.For your
analogous traits provide the following information (25 pts):
a.
Briefly describe the two different species that
possess the analogous trait. (5 pts)
The two species that have an analogous trait is a
butterfly and a bird. A butterfly is a beautiful species that has wings and
antennas, flies around and drinks nectar. A bird is a species that has
feathers, beaks and claws. They fly as well and migrate when needed.
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. (10 pts)
The butterfly and bird both have the analogous
trait of wings. Both a butterfly and a bird use their wings to fly and get to
their destination.
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? (5 pts)
There is a high chance that these two species do
not have a similar ancestry due to the fact that one is an insect and the other
has a skeletal structure and is a bird. The may share some sort of ancestry but
possibly very little.
d.
Provide an image of each species in this
comparison. (5 pts)
Great examples of both homologous and analogous traits.
ReplyDeleteThe only point I would have liked clarified was the issue of ancestry. Both humans and whales are mammals, and all mammals have this limb structure, so yes, this was inherited from a common ancestor, with differences evolving due to environmental changes. The analogous trait is much harder because of the evolutionary difference between the two species. But you really only have to trace the bird back to its first ancestor that DIDN'T have a wing. If you can find one (and it is there in the reptiles), then that means that the bird did not inherit the wing structure from an ancestor (billions of years go) common with the butterfly.
Other than that point, good post.
In regard to your homologous trait in humans and whales, I believe you could have talked more about the specialization of the limbs to their environments. While they are structurally the same, human arms have developed for use in grabbing things, while whale fins developed for use in swimming. While our arms bend and fingers can grasp things, whale fins are almost like a single object, rather than a mixture of components.
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