r, is affected by organismal size and generation time.

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#Id: 7048

#XL - T Zoology

Theory of recapitulation - Ernst Haeckel

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#XL - T Zoology

He proposed that the embryonic development of an individual organism (its ontogeny) followed the same path as the evolutionary history of its species (its phylogeny).

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#XL - T Zoology

Bergmann’s rule: populations in colder climates tend to have greater body mass than those in warmer climates. This pattern is so common that it has a name 

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#Id: 7051

#XL - T Zoology

Haldane’s rule: hybrid sterility or hybrid inviability is often limited to the heterogametic sex. 

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#Id: 7052

#XL - T Zoology

Hamilton’s rule:  It states that an allele that causes an altruistic behavior will spread if the following condition is met (rb>C)

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#XL - T Zoology

Cope’s rule:  A proposed generalization that individual body size in animals tends to increase during evolution.