Natural Selection Lab Report Essay

Natural Selection Lab Report
Natural selection relies upon the assumption that all organisms produce more offspring than can survive in an environment demonstration limited resources. In this lab, we are trying to see which prey (beans) would survive and which predators (students with different type of mouthpart) would survive. I think green bean would survive because it is very tiny. The predator use hand as mouthpart would survive. To start the lab, we need seven different beans together, which includes split pea, kidney bean, large white bean, black bean, pinto bean, small white bean, and red bean.

Each type of beans has to be 100. Once each of these collections of beans is measured out, the entire collection can be dumped on lawn for the predators to pick up. Then we select 15 students and divided evenly into 5 groups: knife, fork, spoon, hand and clothespin. These mouthparts are the only part of the predator that can touch the ground. Each predator can then receive a cup, which will serve as the stomach into which the prey will be placed.

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The prey gathered. Only their mouthparts may pick up the beans. The beans must then be placed into their stomach. The predators had 5 seconds to simultaneously pick up as many prey as they can. At the end of 5 seconds, each predator counts the number of beans. The predators are then ranked according to the number of prey they picked up. The result of first generation are 0 knife survivors, 2 fork survivors, 3 spoon survivors, 2 hand survivors and 1 clothespin survivors. For the prey, split pea has the most survivors which is 72, the least is large white beans. Then we repeated the same steps of preparation for the 2nd and 3rd generations. The results for both 2nd generation and 3rd generation are spoon and hand predator have the most survivors. Split pea has the most survivors while large white bean has the least.

The final results came out the same with my hypotheses. The hand and spoon predator survived because compared to others, they are more efficient. The split peas are tiny than other beans so they have a larger chance to survive. The number of prey left on the lawn is different from the number we calculated. The reason may be some beans are being destroyed or spread out of the lawn. Another reason may be we counted the wrong number of beans as we started.

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