Natural Selection
Look at an example to help make the concept natural selection
clearer:
Industrial melanism is a phenomenon that affected over 70
species of moths in England. It has been best studied in the peppered moth, Biston
betularia. Prior to 1800, the typical moth of the species had a light
pattern. Dark colored or melanic moths were rare and were therefore collectors'
items.During the Industrial Revolution, soot and other industrial
wastes darkened tree trunks and killed off lichens. The light-colored morph of
the moth became rare and the dark morph became abundant. In 1819, the first
melanic morph was seen; by 1886, it was far more common -- illustrating rapid
evolutionary change. Eventually light morphs were common in only a few locales,
far from industrial areas. The cause of this change was thought to be selective
predation by birds, which favored camouflage coloration in the moth.
The following is a quote
from Charles Darwin :
"Variation
is a feature of natural populations and every population produces more progeny
than its environment can manage. The consequences of this overproduction is
that those individuals with the best genetic fitness for the environment will
produce offspring that can more successfully compete in that environment. Thus
the subsequent generation will have a higher representation of these offspring and
the population will have evolved."
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| From:http://image.slidesharecdn.com/topic4-130917213109-phpapp01/95/summary-of-topic-41-biodiversity-in-ecosystems-15-638.jpg?cb=1379967830 |
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