The Discovery Process Types of microscopes: Dissecting: has 2 eyepieces and used for looking at a fly. Is AD and used reflecting light Lower magnification, higher resolution Compound: has 1 eyepiece and is used for looking at a cross-section off plant. AD and uses transmitted light Higher magnification, lower resolution Microscope objectives include xx, lox, xx, xx, -As you move to a higher power, your field of view decreases -Parametric: whatever is in the middle of your field of view will remain there as you go too higher power -Approval: once something is in focus at a lower power, it will stay in focus at a high power An object is always being magnified at lox, so if you use the xx objective, multiply these 2 values together to get the total magnification. The 4 Unifying Theories of Biology 1 . The Cell Theory: Robert Hooked observed cells. All organisms are composed of cells that have DNA. 2. The Gene Theory: DNA is made up of nucleotides that contain a sequence.
The sequence can be changed by mutation or crossing over. 3. The Theory of Heredity: changes in DNA sequence may produce changes that can be passed own to the next generation 4.
The Theory of Evolution: organisms form Into a more complex group over time, better survival % The Scientific Method Step 1- Observe and Formulate Questions Step 2- Reflect on the Implications Step 3- Propose a Hypothesis Step 4- Test the Hypothesis Step 5- Analyze the Results Step 6- Support, reject or modify the hypothesis How to write a hypothesis: “If _[l do this] then _[TLS] will happen. ” The dependent variable represents the response to the factor that changes. (The utensil used) The Independent variable Is the factor that changes.