BIO 105 Science of Biology w/Lab

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Experiment 3Stochastic Events Experiment Inventory

Materials Beads in Beaker #1 (from Experiment 1)

Beads in Beaker #2 (from Experiment 1)

Labware 100 mL Beaker

EXPERIMENT 3: STOCHASTIC EVENTS

Suppose that the same population of butterflies is in the path of a hurricane (Figure 6). All survive, but ten are blown to a new loca tion. These ten start a new population, and their progeny will reflect the founder’s gene pool. This is known as the founder effect.

Figure 6: Butterfly populations before and after a hurricane.

PROCEDURE

1. Randomly select 10 beads from Beaker 1 and place them into the unused 100 mL beaker. Label this beaker as Beaker #3.

These are the founders of your new population.

2. Examine and compare the beads in Beaker 1 with the beads in Beaker 3.

3. Place the beads back in their respective beakers.

4. Repeat this process, this time randomly selecting 10 beads from Beaker 2 and placing them into Beaker 3.

5. Examine and compare the beads in Beaker 2 with the beads in Beaker 3 and answer the post-lab questions.

Note: When you are finished with this experiment, return the beads to their appropriate beakers.

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