01:119:115 Lecture Notes - Lecture 21: Species Problem, Reproductive Isolation, Macroevolution

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rubyturtle895

5 Dec 2016

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Lecture 21 - macroevolution: biological species concept, introduction. Species - latin for kind or appearance . Speciation - processes where one species splits into two new species. Microevolution - changes over time in the alleles in a population. Macroevolution - a broad pattern where species are formed. How is a species defined: components of the bsc. The biological species concept = species is a group of population whose members: Gene flow between populations holds the phenotype of a population together: limitations of the bsc. Potential to interbreed in nature and produce viable, fertile offspring . Is it possible to test all individuals: three other definitions of species, morphological species concept. But must agree on characters: ecological species concept. Species is defined by its niche (role in environment) But must understand complex interactions: phylogenetic species concept. Reproductive isolation in biological species: prezygotic isolation mechanisms offspring. Reproductive isolation - barriers that impede two species from producing viable, fertile.

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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01:119:115 Lecture Notes - Lecture 21: Species Problem, Reproductive Isolation, Macroevolution

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