RNA polymerase can initiate a new RNA chain de novo on a DNA template and thus does not need a primer

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#Id: 3051

#Unit 10. Ecological Principles

The rate of extinction is low at the time of first colonization and immigration rate is highest

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#Id: 3052

#Unit 10. Ecological Principles

Earlier arriving species tend to be r-selected species, which are better dispersers, whereas later arriving species are generally K-selected species, which are better competitors.

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#Id: 3053

#Unit 10. Ecological Principles

Island biota size varies with distance from the source pool and island size.

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#Id: 3054

#Unit 10. Ecological Principles

The number of species should decrease with increasing distance of the island from the mainland - The species distance hypothesis

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#Id: 3055

#Unit 10. Ecological Principles

The number of species should increase with increasing island size. This is also known as the species-area hypothesis.

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#Id: 3056

#Unit 10. Ecological Principles

Larger populations are more resistant to extinctions.

Greater ranges of habitats promote increased speciation rates.