When Pr molecules are exposed to red light, most of them absorb it and are converted to Pfr, but some of the Pfr also absorbs the red light and is converted back to Pr because both Pr and Pfr absorb red light. 

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#Id: 2211

#XL - T Zoology

Darwin’s evolutionary theory- Evolution as such is the simple proposition that the characteristics of organisms change over time.

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#Id: 2212

#XL - T Zoology

Darwin’s evolutionary theory- Common descent

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#Id: 2213

#XL - T Zoology

Gradualism is Darwin’s proposition that the differences between even radically different organisms have evolved by small steps through intermediate forms,  not by leaps

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#Id: 2214

#XL - T Zoology

Populational change is Darwin’s hypothesis that evolution occurs by changes in the proportions (frequencies) of different variant kinds of individuals within a population.

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#Id: 3162

#XL - T Zoology

Natural selection was Darwin’s brilliant hypothesis, independently conceived by Wallace, that accounts for adaptations, features that appear “designed” to fit organisms to their environment.

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#Id: 3163

#XL - T Zoology

 Orthogenesis- “Straight-line evolution,” held that the variation that arises is directed toward fixed goals.