have ____ but their most recent common ancestor, z, did not”). 5. Describe one example of vestigial structures that you can find among the caminalcules. These are structures that have been reduced to the point that they are virtually useless. Ear muscles and the tailbones are examples of vestigial structures in our own species. 6. Explain how vestigial structures provide clues about a species’ evolutionary past. Illustrate your argument with vestigial structures found in humans or other real species.
Thursday 28 September 2017
Evolution Part 3: Problems
Evolution Part 3: Problems 1. You will notice that some lineages (e.g. the descendants of species 56) branched many times and are represented by many living species. What type of ecological conditions would result in the rapid diversification of some lineages? (A real world example would be the diversification of the mammals at the beginning of the Cenozoic, right after the dinosaurs went extinct.) 2. Some lineages (e.g. the descendants of species 58) changed very little over time. A good example of this would be “living fossils” like the horseshoe crab or cockroach. What is an example of an ecological condition that might cause this to happen?3. Some caminalcules went extinct without leaving descendants. In the real world, what factors might increase or decrease the probability of a species going extinct?4. Find one example of convergent evolution among the caminalcules. This means finding cases where two or more species have a similar characteristic that evolved independently in each lineage. The wings of bats, birds and bees are an example of convergence since the three groups did not inherit the characteristic from their common ancestor. Write your answers in complete sentences (e.g. “Species x and y both
have ____ but their most recent common ancestor, z, did not”). 5. Describe one example of vestigial structures that you can find among the caminalcules. These are structures that have been reduced to the point that they are virtually useless. Ear muscles and the tailbones are examples of vestigial structures in our own species. 6. Explain how vestigial structures provide clues about a species’ evolutionary past. Illustrate your argument with vestigial structures found in humans or other real species.
have ____ but their most recent common ancestor, z, did not”). 5. Describe one example of vestigial structures that you can find among the caminalcules. These are structures that have been reduced to the point that they are virtually useless. Ear muscles and the tailbones are examples of vestigial structures in our own species. 6. Explain how vestigial structures provide clues about a species’ evolutionary past. Illustrate your argument with vestigial structures found in humans or other real species.
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