Heredity/natural selection questions

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taki
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Heredity/natural selection questions

Post by taki » Sun Apr 23, 2006 8:01 pm

Could a characteristic that is not controlled by heredity be subject to natural selection? Why?

Also, are there any similarities between natural selection and artificial selection?

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kabuto
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Re: Heredity/natural selection questions

Post by kabuto » Mon Apr 24, 2006 1:47 pm

taki wrote:Also, are there any similarities between natural selection and artificial selection?


yes, they both contain the word 'selection' :wink: :wink:

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AstusAleator
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Post by AstusAleator » Tue Apr 25, 2006 1:04 am

What characteristics aren't controlled by heredity? ? ? I must be dumb because I can't think of any atm.

There are similarities between natural and artificial selection. Both have negative effects on species with undesired or unfit traits. Artificial selection simply uses natural selection by changing the environment an organism is in so that "fitness" is determined by whatever the desired trait is.
For example, chicken farms have artifically selected chickens with such large breasts that they can't even walk. Under natural conditions this wouldn't happen, as selective pressures would decrease the fitness of large-breasted chickens. But in the chicken farms, their fitness is actually increased, as their offspring are allowed, even encouraged, to reproduce.
What did the parasitic Candiru fish say when it finally found a host? - - "Urethra!!"

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