LAB: Natural SelectionGroup 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 – environmentdependent – survival of bean populationconstants – 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).

Light

Dark

Graph:

Analysis:

Conclusion: