Read Seven Days, chapter 4, "Human Beings: A Special Creation"
(2nd part of the last handout)
Consider our unfortunate bare bunnies and and the modeling experiment that we did Thursday. What other scenarios of natural selection could you model with the beans? leave comment:
Here is my example (sorry, I picked the easiest one):
What we looked at was a trait which resulted in 100% removal of the ff genotype and eventually the f allele. But what if 50% survived? How would you model that, and what would you expect the results to be? I would remove only 1/2 of the white beans (ff). I hypothesize that the two lines representing allele frequency would move apart, but would stabilize before the f allele was wiped out.
So there you have it. Now you think of something. And leave a comment.
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In our first experiment we had 50 white beans and 50 black beans. As you could see the white beans dropped on the graph fast. However, what if we recreated this experiment using the same process of elimination and had 200 white beans and 50 black beans? How diverse would the lines be in comparison to our past experiment? Would the survival time of the white beans be substantially greater? Or similar to the time in our previous experiment?
ReplyDeleteThe beans would have a MUCH higher chance of being heterozygous white because of the 1:4 ratio. The first generation or two will have similar percentages, then we would get the same results as we did last time. I did the math using probability.
ReplyDeleteG1:white/200/80%:black/50/20%
G2:white/40/44%:black/50/56%
G3:white/22/31%:black/50/69%
and so on.
I think it would be fun to take the 200w and 50b, and give the hairless ones a 25% survival rate, and then suddenly on G3, the hairy ones have a 50% chance of surviving and the hairless ones are fine, all because of global warming!
ReplyDeletehttp://i.imgur.com/7VyAD.jpg
ReplyDeleteI thought you would enjoy the above link! Its a made from jelly beans!