Announcements- Tommorrow, Friday, January 28th, 2011, we have a bio day that is located in the auditorium. Go straight to the auditorium during period 8.
In Class- We did a lab in class on natuaral selection. It can be found on pages 17-19 in your green unit packet. The procedure for this lab went as follows:
- You would spread a piece of fabric out on the table.
- Grab 10 different colors of paper, and hole punch each color 10 times and put them on the cloth, so you have a total of 100.
- 2 members of the group would act as "predators," which means that they would pick 40 pieces of paper each, but turning away after each pick and picking the 1st color that they saw with no hesitation.
- Collect the 20 remaining pieces on the cloth and record the number of each color remaining on the data table on page 18.
- Add 4 chips of the same color for every chip that remains from the original population, now the total should be 100 again.
- Repeat the picking procedure for the second and third generations and record your data in the same place.
Purpose- The most important thing when doing these labs is to understand why they are being done. The purpose of this lab is to learn how natural selection works. And to also reinforce your concept of to how natural selection works with a demonstration.
NATURAL SELECTION: The process by which organisms with variations most suited to their local environment survive and leave more offspring. It occurs in any situation when more individuals are born than can survive, there is heritable variation, and variable fitness among individuals.
(Those terms and definitions can be forund in your textbook, Ch. 16, section 3.)
NEXT SCRIBER: Sammie
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