Exam questions

Discussion of everything related to the Theory of Evolution.

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Exam questions

Post by ajs » Fri Apr 21, 2006 11:22 am

Exam questions not sure about them. Maybe someone can help me:

What are the shortcomings of fossil record as a tool in studying evolutionary processes?

Does evolutionary change only proceeds through natural selection only?
(No it can proceed by genetic drift, mutations. others?)

Is this an evolutionary change? Why?
Humans living in developed countries are generally larger than their recent ancestors as a result of better diet and medicine.
(Yes. Why?)

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Post by Khaiy » Fri Apr 21, 2006 4:55 pm

1.) Many guesses have to be made about organisms when all we can see are their bones.

2.) You've got enough of a start on this one.

3.) No. You can only say that evolution has occurred when there is a shift in gene frequencies in a population. Applying better diet and medicine will make people healthier, and in this case larger, but won't necessarily change the frequencies of genes within the population.

I'm sure that there are more reasons for #1, but I can't think of any just now. And if I'm mistaken on anything, someone please correct me.

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Post by rg » Mon May 08, 2006 6:57 pm

genetic drift and mutations can operate to cause speciation only in SMALL POPULATIONS.....

one of the reasons for the shortcomming is that carbon dating commonly used in determining the age of fossil requires very complex calculations which increase the error in the measurement....

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Post by AstusAleator » Tue May 09, 2006 12:17 am

The fossil record is not continuous. Certain conditions are needed for the formation of fossils. Fossils were not formed everywhere there was life, nor were they formed during every time period.

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