Today in class we went over unit packet 13-16. Afterwards we started on our lab which is on pages 17A-17E.
The lab is called biochemical evidence for evolution. In the introduction it talks about the theory of evolution and how it is considered to be pivotal importance to modern biology, and how organisms change over time. It then talks about homologous structures which are structures that come from a common ancestor but have different functions. Specific examples are human, whale, cat, bird, and bat's bone. Also it talked about vestiges which are organs from our ancestral species but now are useless. An example is the appendix or coccyx. It later talks about embryology which shows evolutionary relationships between vastly different organisms. It helps show that early stages of development or organims are extremely similar.
Lab Procedures: We were supposed to get into groups of 4. We needed 5 testing well trays, 1 vial simulated human antiserum, 10 stirring picks, 3 plastic dropping pipettes, 1 vial of simulated human serum, 1 vial of simulated cow serum, 1 vial of simulated chimpanzee serum, 1 vial of simulated frog serum, 1 vial of simulated monkey serum water. We recieved five trays with 8 dents with them and supposed to label each dent 1-8. Each stimulated serum, recieved its own tray. Next we were supposed to place serum adn dilute it with water and then mix it.
The following numbers go by dent number, drops of serum, and drops of water
Then we were supposed to put 8 drops os human antiserum and each dent adn mix it as well. We were supposed to wait two mintes to observe the reactions. We were supposed to observe if any agglutination occured and record it in the data table. It heavy agglutination occured then you should put down +++, for medium then ++, for slight then +, and for no then -.
On the picture on the top right is homologous structures, on teh left is examples of embroylogic developments for evolutionary realtionship, and on the right side bottom is picture of aggulunation in serum.
Thank you, Yours truely Jex
Monday, January 30th, 2012
Next Scribe: Jackson