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fandomhigh2005-11-30 07:17 pm
the-ascended.livejournal.com) wrote in fandomhigh2005-11-30 07:17 pm
Introduction to Anthropology
"Good morning. I'm expecting projects in from Samuel Anders, Chihaya, Harry Potter and Willow Rosenberg in, so if you could leave those in the tray on my desk please.
Continuing on with our lessons on popluation genetics, today we're looking at genetic drift.
Genetic drift is the constant tendency of genes to evolve even in the absence of selective forces. Genetic drift is fueled by spontaneous neutral mutations that disappear or become fixed in a population at random. Inbred lines separated from a common ancestral pair can drift rapidly apart from each other.
The survival and reproductions of organisms is subject to unpredictable accidents. It doesn't matter how good your genes are if you get killed before producing offspring.
An ant gets stepped on.
A rabbit gets swept up by a tornado.
An elephant drinks up a protozoa living in a puddle.
A plane crashes killing a Nobel Laureate.
None of the above events has anything to do with the dead organism's genotype or phenotype - these events occurred purely by chance.
"Your homework tonight is to do the five questions on this Driftworms simulation, which I want in on Friday. You can read about the simulation here
Any questions?"
Continuing on with our lessons on popluation genetics, today we're looking at genetic drift.
Genetic drift is the constant tendency of genes to evolve even in the absence of selective forces. Genetic drift is fueled by spontaneous neutral mutations that disappear or become fixed in a population at random. Inbred lines separated from a common ancestral pair can drift rapidly apart from each other.
The survival and reproductions of organisms is subject to unpredictable accidents. It doesn't matter how good your genes are if you get killed before producing offspring.
An ant gets stepped on.
A rabbit gets swept up by a tornado.
An elephant drinks up a protozoa living in a puddle.
A plane crashes killing a Nobel Laureate.
None of the above events has anything to do with the dead organism's genotype or phenotype - these events occurred purely by chance.
"Your homework tonight is to do the five questions on this Driftworms simulation, which I want in on Friday. You can read about the simulation here
Any questions?"
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