BIOA02H3 Lecture : Species and their Formation (Part I & II)

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greyant482

1 Apr 2011

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speciation: the process by which one species splits into two or more daughter species. occurs gradually, and through a time line, you can tell where the distinction happens. recognize species by their appearance (darwin did this) binomial system of nomenclature (genus names ex: homosapiens) did not recognize offspring differences and male/female differences: 2. species are groups of actually and potentially interbreeding natural populations which are reproductively isolated from other such groups. Individuals in a population can mate with each other but not with those of another population: they are distinct evolutionary unit within which genes recombine. species sometimes change by adapting to the changes in their environment. If a species becomes allele and genotype frequencies change and result of evolutionary mechanisms isolated into 2 populations, within each isolated gene pool, They no longer can interbreed once the barrier is removed. how? www. notesolution. com: allopatric speciation: physical barrier between species.

Related Questions

The Biological Species Concept is based upon which of the following criteria that are used to distinguish a separate species?

reproductive isolation

diagnostic morphological features

monophyly

species-specific mate recognition mechanisms

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

cyanbuffalo931

Two populations of birds (one in California, the other in Virginia) appear different from one another with respect to their pattern of coloration, wing shape, and body size. However, when the phylogenetic species concept (as presented in class rather than by our textbook authors) is applied, the bird populations are placed in the same species. Based on that information, what must be true:Answerneither bird population has a fixed unique combination of character states relative to all other populations in that same species the populations are not reproductively isolated from one another (i.e. inter-breeding between them results in fertile offspring)both populations together form a monophyletic group

cyanllama479

BIOA02H3 Lecture : Species and their Formation (Part I & II)

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