1a. Two species that possess the homologous trait are a human and a dolphin. Both seem to have some sort of arm or limb in order to get things and get places. A human has an arm living on land and a dolphin has a fin living underwater.
1b. Humans and dolphins are different in many ways. Dolphins live in the ocean, swimming around in water with FINS while humans live on ground and do many things like drive and write with an ARM. Humans and dolphins eat differently as well. We can eat so many things, while dolphins are limited to food like fish. A humans hand looks more defined and easily read with 5 fingers to look as if they easily grab things,while a fin looks like a flat fin they use to swim, but in reality it is easy for them to use in so many ways. The bones of the human and dolphin (image below) are shaped differently, with an arm looking straight and a fin looking more ovalish. Dolphins use a fin to communicate while we use our voices and use hands to handle with things, like driving and dolphins can swim with it, as a mean of transportation. In term of the bone structure, humans have a clavicle and a right scapula for example and a dolphin has a rudimentary ulna that the human doesn't. Also, They do share a bone placement like a thumb.
1c.The general ancestor of a human and dolphin can possibly be the development of the bone structure of a human's arm and a dolphin's fin, as they are both mammals and must have been shared by a common ancestor, both having different structures and functions. They both need their arm and fin to be able to do things and without it they wouldn't be able to do as many things.
1d.
ANALOGOUS
2a. Two examples of analogous species are a butterfly and a bird wings. Butterflies have more various and colorful wings, antennas, light weight insect. A bird has a beak, feathers, and legs for example, Both share wings in order to fly.
2b. Both share many similarities and the main similarity is both a butterfly and bird have wings. they use these wings to fly to get from place to place, to get food for example and these wings are make them who they are. Both have unique sets of wings that connect to parts of their main bodies. An example of the bird can be a dove and an example of a butterfly is the monarch butterfly.
2c. A common ancestor cannot be seen in both a butterfly and a bird because no ancestor of theirs had wings. It may have possibly been through a reptile and did not share these similarities millions of years ago.
2d.
Very good description of your homologous trait. Complete and thorough. You also did very well walking your reader through the logic of ancestry to demonstrate that the required genetic relationship was there.
ReplyDeleteGood description on your analogous trait. Ancestry tripped you up a bit. The common ancestor of birds and insects existed 100's of millions of years ago, but do we really need to know who that ancestor was and what they looked like to know these are analogous traits? We know a lot about bird evolution. Birds evolved wings during the split with reptiles, long after that distant split with insects. That is all we need to confirm that the evolution of wings in birds was independent of the evolution of wings in insects.
I really enjoyed reading your response. Very well written.
ReplyDeleteReally learned a good amount from your homologous trait! I also t think you really good job of comparing the differences uses of an arm and fin between the two species.
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