Evolution Film - questions & notes
Evolution Film - questions & notes BIO 152
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This 3 page Class Notes was uploaded by Samuel Croteau on Saturday April 16, 2016. The Class Notes belongs to BIO 152 at Massachusetts College of Pharmacy & Health Sciences taught by Dr. Demasi in Fall 2016. Since its upload, it has received 17 views. For similar materials see Biology of the organism in Biology at Massachusetts College of Pharmacy & Health Sciences.
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Date Created: 04/16/16
11) Example of the two pocket mice, what makes them different, at the genetic (DNA) level, and the phenotypic level? (31:00-33:00) 1 They have the almost Identical DNA but the T is switched with a C. 2 2)What type of natural selection is occurring in these mice (disruptive, directional, selective)? 1 Natural selection that is occurring in thee mice are directional because of what has happen to the land. 2 3)What type of reproductive isolation is starting to occur with these mice? 1 The difference that is happening to the mice reproductive isolation is that they don't live in same habitat and have behavioral difference that causes them not to mate with each others. 3 4)Would you consider these mice different species, right now? Why or why not? 1 I wouldn't as of right now but they will become different species if they keep going the way they are by not being involved with each other. 1 5)Most animals on earth share the same body plan genes. When are these genes used? (43:00 -48:00) 1 These genes are use to make the embryo into the animal its suppose to be. Example the mice have the same genes but if the gene isn't turned on then the mouse has dark fur if it is turn on the color is light. 2 6)In the example of the spotted-wing fruit fly and the non- spotted fruit fly, what type of reproductive isolation is present between these flies? (48:00-51:00) The reproductive isolation between the flies are specialization because one uses the spots to attract a mate to repopulate but in the other flies they dance around instead. 0 7)Would the two types of flies be considered different species, right now? Why or why not? i No because they still have the same reproductive attributes but they don't make with each other. They have almost identical genes as well in few thousand years they will be different species. 1 8)What is the genetic difference between the spotted- wing fruit fly and the non-spotted fruit fly, involving the paintbrush gene? The only difference is that one fly has that trait turned on while in the womb and one fly doesn't which makes one with spots and one with out. 0 9)What did Darwin see in snake embryos? What is found in whales? How do these suggest whales and snakes evolved from ancestors that had legs? (53:00-55:00) 1 Darwin found that snakes and whales have evolved from animal that has legs because in the skeletal and embryo make up they have legs but then the further it goes through the more they turn out to become fins or slowly disappear in the snakes case. 1 10)How have lake stickleback fish evolved differently from marine (ocean) stickleback fish , at the organ level and the DNA/gene level? (55:00-58:00) 1 They have changes because the lake silver back don't have spikes on the bottom of their bellies like they us e to when they were out in the ocean. 11)What is the same and different at the DNA/gene level between these two fish? i The difference is whats on their bellies but at DNA level the only thing that is different is that the gene is completely mutated into something else because they don't need spikes on their bellies since they have gotten stuck in the lake. 2 12)What type of speciation occurred with these different species? i That the spikes on their bellies have change because they have been separated from each other but everything else about these fish are exactly the same. 2 13)Manatees, whales, and snakes all evolved from ancestors that had hind legs. How does an animal 'lose' its limbs? (58:00-1:00:00) 1 Over thousands of years of mutations and variations throughout the population. Sometimes it occurs quicker depending on what has been influence in the environment. 3 14)Why do the finches on the Galapagos Islands have different shaped beaks? What is different about their beak genes? How did the environment help select for beak shape? (1:00:00-1:06:00) 1 They have different shape beaks depending on the food they typically eat around the island. The differences in there genes are how the lengths are which are on the codes of there genes which tells you the length it will be. 1 15)Why is it true to say that embryonic development is where genetic variation has the greatest impact? 1 It has the greatest impact because that’s where the most mutation can occur in the embryo. 0 16)Fossil record shows that creatures with legs appeared 365 million years ago. Before that, what was there? There were either wings or fins depending on what creature that there evolve from.
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