Evolutionary Forces

Evolutionary Forces.



Demonstrate how sample size can influence how close an expected result is to an observed result. This 2021 exercise shares that information, and asks you to do a few calculations and to graph your results. You have two options: Print or download this document and fill it out (pen or typing) and then save it or scan it and upload it as a Word or PDF document. Or you can download the Excel sheet (next link), do your work in it, save it, and then upload it. (It will graph your results as you enter your calculations). Don’t submit both options, just one.
Here is what we did last winter. I brought to class a cloth bag to model the allele pool.

Expected Observed
YY 3.6 1
YP 4.8 7
PP 1.6 2
total 10 10

1. Calculate the allele frequencies for the gene pool created in last year’s class. Use p for pink (P) and q for yellow (Y). You can check your answers because you can calculate p2 and q2 and 2pq to generate the expected values in the table above.


2. Complete the tables for twenty, thirty, and forty fertilization events, and graph your results.

3. Write one sentence that describes the relationship between (a) sample size, and (b) how well observed values match expected values.




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Evolutionary Forces


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