Question

• If a species of anoles with dark dewlaps colonized a heavily forested island, predict what would happen over time to the color of the dewlap. Using your knowledge of natural selection and genetics, explain your prediction. • To minimize interspecific competition, organisms often divide the limited available resources in an area, a concept called "resource partitioning." As an example of this concept, the figure below illustrates how different species of warblers utilize different portions of an individual tree. • Explain how the different species of anoles on an island demonstrate "resource partitioning" similar to the warblers in the figure. Explain how resource partitioning can promote long-term coexistence of competing species, thus increasing biodiversity. Experiments showed that mice lacking Pitx1 gene function did not develop complete hind limbs. These animals just had the remnants of a pelvis and hind limbs, and what was left of these structures was larger on the left than on the right side.

          • If a species of anoles with dark dewlaps colonized a heavily forested island, predict what would happen over time to the color of the dewlap. Using your knowledge of natural selection and genetics, explain your prediction.
• To minimize interspecific competition, organisms often divide the limited available resources in an area, a concept called "resource partitioning." As an example of this concept, the figure below illustrates how different species of warblers utilize different portions of an individual tree.
• Explain how the different species of anoles on an island demonstrate "resource partitioning" similar to the warblers in the figure. Explain how resource partitioning can promote long-term coexistence of competing species, thus increasing biodiversity.
Experiments showed that mice lacking Pitx1 gene function did not develop complete hind limbs. These animals just had the remnants of a pelvis and hind limbs, and what was left of these structures was larger on the left than on the right side.

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• If a species of anoles with dark dewlaps colonized a heavily forested island, predict what would happen over time to the color of the dewlap. Using your knowledge of natural selection and genetics, explain your prediction.
• To minimize interspecific competition, organisms often divide the limited available resources in an area, a concept called "resource partitioning." As an example of this concept, the figure below illustrates how different species of warblers utilize different portions of an individual tree.
• Explain how the different species of anoles on an island demonstrate "resource partitioning" similar to the warblers in the figure. Explain how resource partitioning can promote long-term coexistence of competing species, thus increasing biodiversity.
Experiments showed that mice lacking Pitx1 gene function did not develop complete hind limbs. These animals just had the remnants of a pelvis and hind limbs, and what was left of these structures was larger on the left than on the right side.

Added by Juan Carlos H.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Christina Sluka

12/09/2021

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This is because in a dense forest environment where there is limited light, dark dewlaps would be less visible for communication and mating displays. Anoles with lighter, more visible dewlaps would have a reproductive advantage, leading to the evolution of lighter Show more…

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If a species of anoles with dark dewlaps colonized a heavily forested island, predict what would happen over time to the color of the dewlap. Using your knowledge of natural selection and genetics, explain your prediction. To minimize interspecific competition, organisms often divide the limited available resources in an area, a concept called "resource partitioning." As an example of this concept, the figure below illustrates how different species of warblers utilize different portions of an individual tree. Explain how the different species of anoles on an island demonstrate "resource partitioning" similar to the warblers in the figure. Explain how resource partitioning can promote long-term coexistence of competing species, thus increasing biodiversity. Experiments showed that mice lacking Pitx1 gene function did not develop complete hind limbs. These animals just had the remnants of a pelvis and hind limbs, and what was left of these structures was larger on the left than on the right side.

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00:01 Okay.

00:02 So in this set of questions, we are thinking about how animals might evolve over time and how things like resource partitioning helps enable biodiversity and enables evolution.

00:15 So first, we're going to talk a little bit about how animals, like a lizard called an animal, might change over time when it's living on a little island.

00:28 So if we think about this, we are talking about an annals doolap, which is a little flap of skin that happens under the anil's neck.

00:41 Here's a little anal.

00:42 The little du lap is the flap of skin.

00:44 That little flap of skin is used for sexual displays, where sexual and other communicatory displays, where presumably the better the du lap, the better the display, and the more the anal can't.

01:02 Reproduce and survive, right? so the more, the better the du lap, the more reproduction, and the more that that duelap shape or color moves on.

01:14 So here we're considering specifically annals that have dark duelaps.

01:19 So here he's got a little bit of a really dark little flap of skin.

01:23 And these annals have just gotten to an island that has a lot of trees on it, right? so it's a heavily forested island.

01:35 And these little annals with dark duelaps have just gotten here, right? now, there is a potential problem with having a dark du lap on a forested island, right? because when forests are really dense, they tend to make the understory dark, right? and that's just because of shade, right? so when there's a bunch of trees, you've got a lot more shade and it makes the ground and anything under the trees darker.

02:03 The problem with that is that when you also have a little lizard with a dark doolap.

02:09 When there's little light, it makes it harder to see that doolap, right? so it makes it harder to see that little flap of skin.

02:23 If it's dark and it's really dark around you, it's just hard to see it, right? so that means that those duelaps are not going to be as effective, right? so we might expect that over time, the duelaps on these little, on these little lizards are going to become lighter...

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