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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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lindseyb1220 lindseyb1220
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5 years ago

Compare and contrast the Darwin-Wallace mechanisms of natural selection and evolution with
  Lamarcks theory of inheritance of acquired characteristics. Explain how both of these concepts
  might apply to the development of long necks in giraffes. What will be an ideal response?
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srw23557srw23557
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5 years ago
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In the case of Darwin-Wallaces ideas: In the population of ancestral giraffes there was some
natural variation; some of the animals had longer necks than others. Those with longer necks
could reach higher into trees and eat leaves that their competitors couldnt reach. These longernecked
animals were more successful, so they survived and reproduced. Finally, after many
generations, the animals looked like modern giraffes.
In the case of Lamarcks ideas: During periods of drought, ancestral giraffes had to reach higher
in the trees for nourishment. This activity stretched the giraffes necks and they passed this
acquired characteristic directly to their progeny.
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