The sigma cycle. RNA polymerase binds to the promoter causing local melting of the DNA. As the polymerase moves elongating the RNA, the s-factor dissociates and joins with a new core polymerase to initiate another RNA chain.

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#Unit 10. Ecological Principles

Clumped: The most common dispersion pattern is clumped, because resources tend to be clustered in nature. 

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#Id: 5379

#Unit 10. Ecological Principles

Uniform: Competition may cause a uniform dispersion pattern between individuals. The pattern of trees and seedlings may appear random as seedlings develop from seeds dropped at random.

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#Id: 5380

#Unit 10. Ecological Principles

1. The dispersion pattern starts out random but ends up uniform.
2. Uniform dispersions may also result from social interactions.
3. Territoriality between animals also causes uniform dispersion patterns.

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#Id: 5381

#Unit 10. Ecological Principles

Random: The rarest dispersion pattern is random because resources in nature are rarely randomly spaced.

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#Id: 5382

#Unit 10. Ecological Principles

Perfect compensation hypothesis

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#Id: 5383

#Unit 10. Ecological Principles

Age-specific fertility rate - Any given age, Proportion of female offspring that are born to females of reproductive age.