BIOA02H3 Lecture 10: Lecture 10-03-11

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blackwildebeest308

8 Feb 2012

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Speciation: the process by which one species split into two or more daughter species, the process happens gradually. Also, within the same species, animals from different parts of the world look different (ex. Reproductive isolation: they can reproduce with each other but not with another population. If species become isolated into 2 different populations, then you have two species that evolve as separate species, they have differences in their genetic structure and the 2 populations may no longer be able to exchange genes. 2 ways the separation of the species can take place: Allopatric specification: when there is a physical barrier that separates the individuals, this is thought to be the dominant mode of separation (glaciers, water body come up, continent split) Darwin s finches: he said that members of the same species looked different because they were raised in different environments (ex.

Related Questions

Which of the following is an example of sympatric speciation? 1. Two populations of salamanders that live on isolated islands and eventually become separate species, unable to interbreed. 2. Different breeds of dog, which live in different areas of the world, but are able to produce fertile offspring. 3. A horse and a donkey, which may interbreed to produce a mule, which is sterile and unable to reproduce. 4. Tow related plant species living in the same area that hybridize, then undergo chromosome doubling, which results in the creation of a third specie of plant that is unable to reproduce with either of the two original species. 5. Three species that evolve from a common ancestral species due to reproductive iisolation, and adaption to different habits.

You are studying an isolated population of birds that are morphologically distinct from other populations of their species. Female birds of this population will not breed with males from other populations when they are artificially brought into contact. You do detailed DNA analyses and find no differences between your focal population and the rest of the species. Based on this information, which of the following concepts would identify your focal population as a unique species?

A. Biological species concept

B. Morphological species concept

C. Evolutionary species concept

D. Both A and B

E. A, B and C

Follow up Q: Do you think your focal population is a unique species? Why or why not?

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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BIOA02H3 Lecture 10: Lecture 10-03-11

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