User:Andrew Barney/Notebook/Old Fruit Fly Lab/2007/11/11

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Lab 3


  • Results:

Phenotype: Wild M Sepia M Wild F Sepia F Total
Vial 1 17 3 16 4 40
Vial 2 17 3 16 4

Chi Square Results:

.26 + .8 +.06 + .2 = 1.32 = .72 confidence

Well Within Acceptable Hypothesis!



My hypothesis was: "Based on Mendel's laws and the results in lab #2, the mode of inheritance of the sepia mutation is Autosomal Recessive."

By using the chi square method, we can compare the results with the expected results, and we can see if our hypothesis is supported. Our answers from the chi square formula were 1.32 (pg. 16), and according to the chi square chart, our answer is about 72% confidence level that out hypothesis was correct. This means we had a very well accepted hypothesis.

For Autosomal Recessive we were expecting 3/4 of the offspring to be wild, and 1/4 to be sepia. We counted 17 wild males, 3 sepia males, 16 wild females, and 4 sepia males. We were expecting ~15 wild females, ~15 wild males, ~5 sepia males, and ~5 sepia females from a 40 fly count. We only counted 40.

It was a flaw that we did not count all fourty, and took a shortcut to get our results. I would improve it by letting everyone have enough time to count each one.

An interesting side experiment would be to try and cross all of the mutant fruit flies together to get a "super mutant", and to observe which traits are dominant to each other or co-dominant, and to see if there are any side effects from having all of the traits. Of course not all of the traits can be inherited, such as wingless and curled wings, but to try and get as many as possible would be cool.