Lab 9 - Lab 9 Natural Selection Scott Buckley 30 October...

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Lab 9: Natural Selection Scott Buckley 30 October 2006 Section 15
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Introduction: Pillbugs are small organisms from the order Isopoda. These bugs usually have seven plates covering their dorsal sides as adults, and grow by molting around four to five times until then. These plates on their backs come in handy when threatened by predators. They have the ability to roll completely into a ball and hide their appendages. They can be found in moist areas with high humidity because they breathe using gills (University of Arizona, 1997). By conducting various tests on pillbugs, we can determine the variation among a small group. Variation is important to a population because it allows for individuals to differ from one another, letting some survive, and some perish. If variation were non existent, then the populous of a species would be sure to die out. The question pertaining to this lab is “What trait or traits are important in differential survival?” I hypothesize that increased sprint speed in pillbugs will make for a greater chance of survival. I will find that the survivors in this experiment will have a higher sprint speed than the victims. Methods: In this lab, the lab manual was used and directions were followed from it (Leady, 2005). During the procedures, the protocol was followed verbatim. Results: The lengths and widths of each of the ten pillbugs were measured with a ruler after each specimen was separately placed in a container. Their sprint speeds were then measured by allowing them each to go for two runs on a small wooden track. The below
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are the calculations for the lengths, widths, plate numbers, and sprint speeds of each individual: Table 1: Survivor Length Survivor 1 12 1.667 2.78 Survivor 2 10 -0.333 0.111 Survivor 3 9 -1.333 1.78 Sum 4.671 Variance 2.34 SD 1.53 Table 2: Victim Length Victim 1 15 4.86 23.62 Victim 2 9 -1.14 1.296 Victim 3 11 0.86 0.7396 Victim 4 7 -3.14 9.86 Victim 5 9 -1.14 1.296 Victim 6 10 -0.14 0.196 Victim 7 10 -0.14 0.196 Sum 37.203 Variance 6.2 SD 2.49 Table 3: Group Length #1 12 1.8 3.24 #2 15
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This note was uploaded on 04/08/2008 for the course BIOL 2150 taught by Professor Koscynski during the Spring '08 term at Toledo.

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Lab 9 - Lab 9 Natural Selection Scott Buckley 30 October...

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