BIOL 1001 Chapter Notes -Species Complex, Species, Allotropy

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champagnegoldfish600

12 Mar 2014

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If gene flow ends, allele frequencies in isolated populations are free to diverge - meaning population begin to evolve independently of each other. If mutation, genetic drift, selection cause isolated populations to diverge sufficiently, distinct types, or species form - that is the process of speciation. Species: evolutionary independent population or group of populations. Four criteria for identifying re in common use: biological species concept, morphospecies concept, ecological species concept, phylogenetic species concept. Biological species concept: critical criterion for identifying species is reproductive isolation, therefore no gene flow. If two species population do not interbreed in nature or if they fail to produce viable and fertile offspring when mating"s take place = distinct species. Groups that both interbreed (naturally) and are reproductively isolated =belong to same species. Prezygotic evolution: which prevents different species from mating. Postzygotic isolation: offspring of mating between members of different species do not survive or reproduce.

Related Questions

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

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BIOL 1001 Chapter Notes -Species Complex, Species, Allotropy

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