LAB: Natural Selection Group Members: Problem Statement: What is the effect of environment on the survival of a population?

Introduction: Read and write a 1 page summary paragraph.

Hypothesis: If the background is __________, then the __________ bean would be most fit for survival in the environment. Materials/Procedure: see lab handout (don’t write it out) Variables: independent – environment dependent – survival of bean population constants – size of initial population, # prey, # predator, time of predation, size of environment

Procedures: 1.Each group will, pick 1 game warden and 3 predators. 2.Game warden will gather supplies and record data. -Pick 20 beans from each population of supply beakers (pinto, white, red, black, lentils, yellow split peas) and add to ziploc bag labeled “beginning population” -Each type represents a different species -Lay a piece of white poster paper in center of lab table (represents light-colored habitat) -Tell predators to turn away from habitat, and spread the prey in the “beginning population” across the habitat. -Predators gets 20 seconds to gather prey (ONLY ONE AT A TIME) using forceps. TEACHER WILL KEEP THE TIME!

3.Recording Data- Determining # prey for each generation -Count the # of each type of prey that the predators captured -Subtract the # of captured prey from the starting #, (write # under “surviving #” in Data Table 1 4.Simulate Reproduction: ‐Add 1 beans for each remaining bean of every type (game warden should get these from supply beakers) ‐Record new “Start # for Gen. 2” in Table 1 (should be 2 times the amount of beans that survived) 5.Generation 2: ‐Repeat predation & reproduction (steps 1 – 5) 6. Class Data: ‐-Record your group data “# surviving” by prey(bean) and generation on board and calculate average # on Table 3 for each habitat type.

6.Change of Environment ‐Game warden should remove light background (poster board) and use the black table tops as new dark- colored habitat 7.Repeat steps 1-5 with new environment. 8.After all data has been collected, all beans MUST be returned to their appropriate bean supply locations (groups will lose 10% of their lab grade for not doing this).

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