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Crossword Puzzle: Ch10
Crossword Puzzle: Ch10

... 5) Remember… the test on Wednesday will be mostly Chapter Ten, but a little of Eight and ___. 7) The law of ___ says that the oldest layers of sedimentary rock will be on the bottom, and the newest layers closer to the top. This helps us figure out the relative age of fossils in the rock. 8) The the ...
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Standard 5 - Bulldogbiology.com
Standard 5 - Bulldogbiology.com

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CH 22: DESCENT WITH MODIFICATION
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... 4. Does natural selection act on phenotypes or genotypes? Does natural selection act on existing traits, or can it work  directly on DNA, creating something completely new?  5. Recognize patterns (be able to give examples) in sexual selection and understand how sexual selection occurs (both  intra‐  ...
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Ch 22 Notes

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15-3: Darwin Presents His Case Notes

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Darwin`s Theory: Homologous, Analogous, Vestigial Features
Darwin`s Theory: Homologous, Analogous, Vestigial Features

... If humans could change the behaviour and appearance of domesticated species, the environment could have similar effects on wild species If Lyell was right about the age of the Earth there could be time for small changes in species to accumulate into large changes over many thousands of generations ...
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Vestigiality



Vestigiality refers to genetically determined structures or attributes that have apparently lost most or all of their ancestral function in a given species, but have been retained during the process of evolution. Assessment of the vestigiality must generally rely on comparison with homologous features in related species. The emergence of vestigiality occurs by normal evolutionary processes, typically by loss of function of a feature that is no longer subject to positive selection pressures when it loses its value in a changing environment. The feature may be selected against more urgently when its function becomes definitively harmful. Typical examples of both types occur in the loss of flying capability in island-dwelling species.
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