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Feathers either play a role, or may have played a role, in _____. (Activity 24A)
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| courtship |
| gliding |
| flight |
| extended hops |
| all of these |
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_____ is rapid speciation under conditions in which there is little competition. (Activity 24A)
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| Microevolution |
| Paedomorphosis |
| Gene flow |
| Genetic drift |
| Adaptive radiation |
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Mass extinctions create conditions that promote _____. (Activity 24A)
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| microevolution |
| paedomorphosis |
| gene flow |
| genetic drift |
| adaptive radiation |
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The appearance of an evolutionary novelty promotes _____. (Activity 24A)
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| gene flow |
| mutation |
| mass extinction |
| paedomorphosis |
| adaptive radiation |
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The different finch species found on the Galápagos Islands probably arose as a result of _____. (Activity 24A)
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| artificial selection |
| adaptive radiation |
| mass extinction |
| gene flow |
| paedomorphosis |
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How do the skulls of adult chimpanzees and humans differ? (Activity 24B)
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| Adult chimpanzees have a less angled skull. |
| Adult chimpanzees have less massive jaws. |
| Adult chimpanzees have heavier brow ridges. |
| Adult chimpanzees have flatter faces. |
| Adult chimpanzees have more rounded faces. |
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Click on the diagrams to start the animations.
The differences between chimpanzee and human observed in these animations is attributable to differences in _____. (Activity 24B)
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| life span |
| skull structure |
| bone composition |
| allometric growth |
| the appearance of the fetal skulls |
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What accounts for human infants having large heads on small bodies? (Activity 24B)
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| formation of the head before the rest of the body during fetal development |
| allometric growth |
| the need to get the infant out through the birth canal |
| head cells having a different genotype than the cells of the rest of the body |
| at birth the human head is NOT relatively large compared to the rest of the body |
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Variations in allometric growth patterns demonstrate how _____. (Activity 24B)
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| relatively large genetic changes can have a minor impact on phenotype |
| relatively small genetic changes can have a major impact on phenotype |
| chimpanzees and humans could not have a common ancestor |
| adult chimpanzees are basically juvenile humans that have gained the ability to reproduce |
| differences in the fetal skulls of chimpanzees and humans lead to very similar adult skulls |
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Which of these is a difference between the skull of an adult chimpanzee and the skull of an adult human? (Activity 24B)
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| The chimpanzee skull is sharper and more angular. |
| The chimpanzee skull has heavier brow ridges. |
| The chimpanzee skull has more massive joints. |
| They result from different patterns of allometric growth. |
| All of these are differences between adult chimpanzee and adult human skulls. |
