A. - The two species that i chose have the homologous trait are the frog and lizard, both share their forelimbs they are constructed the same yet serve different functions.These animals share same bones, humerus, radius, and ulna.
B. - The difference in structure is that the frogs rely and use their forelimbs to jump and to stay rested. While lizards use their forelimbs to run. These homologous traits show differences in structure between the two because they are used in different ways and at different times. They each use them regarding to their everyday needs and do not have the same purposes.
C. - The common ancestor of these species is the Eusthenopteron, we know that this ancestor possesed this homologous trait by studies of fossils from earlier times.
Analogous :
A. - two species that possess analogous trait are the Bird and the moth. Both species fly yet have different purposes and ways of surviving that differ.
B. - A bird and the moth both fly and use their wings to fly with. Although each use it for different reasons, they share the analogous trait that they have wings and each one has different purposes.
Good work on the homologous trait. I'm not sure if we have to go back to fish to find a common ancestor, just back to an early amphibian, but as long as you understand that the common ancestor possessed the trait and passed it onto the modern species, you are in good shape.
ReplyDeleteYou've got the function leading to structure idea on the analogy. Did you have information on the common ancestor? Did that ancestor possess wings or pass them onto both species, or did the wings arise independently?