BIOA02H3 Lecture : Chapter 23
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1. Scientists found that different beak shapes lead to differentmating songs in Darwin's finches. This result best supports whichhypothesis?
A. Darwin's finches are not different species according to theBiological Species Concept. | |
B. Behavioral isolation in Darwin's finches is unrelated to beakshape. | |
C. Adaptation to different food sources likely occurred afterreproductive isolation in Darwin's finches. | |
D. Adaptation to different food sources indirectly led tobehavioral isolation in Darwin's finches. |
2. Which of the following could occur if two partiallyreproductively isolated populations become sympatric? Check allthat apply.
| A. Gene flow between the populations will occur |
| B. The populations may eventually become separate speciesthrough reinforcement |
| C. The populations will continue to be partially reproductivelyisolated |
| D. The populations may eventually lose their geneticdistinctiveness |
| E. Hybrids will be inviable or infertile |
3. In which population would the rate of genetic drift be thegreatest?
A large population that is geographically isolated from itsparent population | |
A small population that is geographically isolated from itsparent population | |
A large population that is not completely geographicallyisolated from its parent population | |
A small population that is not completely geographicallyisolated from its parent population |
4. Indicate true or false that the following organisms would beconsidered separate species according to the biological speciesconcept. (T/F)
1. Lions and tigers can interbreed successfully to produce viable,fertile offspring, but lions live in open grasslands and tigerslive in dense forests. (T/F)
2. Black bears in the United States can have coat colors rangingfrom blonde to jet black, but bears with different coat colorsoccupy the same habitat and interbreedsuccessfully. (T/F)
3. Many leopard frogs in the eastern United States look the sameand can mate to produce a fertilized egg, but the embryo does notdevelop past the early stages. (T/F)
4. Many of Darwin
Which of the following statements best explains the process of allopatric speciation?
Genetic differences accumulate between populations that are isolated by a geographic barrier, eventually leading to reproductive isolation. |
Genetic differences accumulate through recombination between populations that are interbreeding, eventually leading to reproductive isolation. |
Genetic differences accumulate in a population through selective mate choice, leading to two groups that breed independently, causing reproductive isolation. |
Two populations in the same geographical area accumulate genetic differences by random chance, eventually leading to reproductive isolation. |
Genetic changes within a population as the result of genetic drift influences traits involved with mate choice, eventually leading to reproductive isolation. What is the basic difference between allopatric and sympatric modes of speciation?
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