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Author Topic:   Darwin- would he have changed his theory?
Chiroptera
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Message 8 of 195 (119582)
06-28-2004 3:49 PM
Reply to: Message 1 by tubi417
06-24-2004 1:55 AM


No, he would not have.
Darwin's theory is this:

Observation 1: Most individuals produce far more offspring than is needed to replace themselves.

Conclusion 1: Most individuals must die without reproducing.

Observation 2: In any population, there is a wide range of variation.

Assumption 1: Those individuals that survive and reproduce will be the ones whose characteristics make it more likely that the individual will survive.

Observation 3: Much of this variation is hereditary.

Conclusion 2: This "natural selection" will cause certain characteristics to decrease in frequency, perhaps even disappear completely; and cause other characteristics to increase in frequency, perhaps to become evident in every member of the population.

Observation 4: Humans have bred many varieties of plants and animals with characteristics that are not observed in the wild ancestral species.

Conclusion 3: There is a source of new heretable characteristics.

Conclusion 4: The production of new characteristics with natural selection will cause a species to undergo a tremendous amount of change over very long time periods.

Observation 5: For each domesticated species, humans have bred a large number of different breeds.

Observation 6: Life can be classified in a heirarchical system.

Conclusion 5: All current (and known past) species evolved from a small number of, perhaps only a single, ancestral species.

Note that there is no assumption whatsoever about the structure of the cell, or even that organisms are composed of cells.


This message is a reply to:
 Message 1 by tubi417, posted 06-24-2004 1:55 AM tubi417 has not replied

  
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