biology 101 professor ben winslow tue, wed, thur 9-12
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Correlation does not equal causation
Marathon heart-attack deaths rise
By Jack KellyPittsburgh Post-Gazette staffTue, 05/15/2012 - 2:25pmRunners suffered heart attacks in the Boston Marathon in April, the Myrtle Beach, S.C., Marathon in February, the New York and Philadelphia marathons last November and the Chicago Marathon last October. These incidents sparked renewed interest in possible links between distance running and heart failure.
Why is there an “ozone hole” in Antarctica?
Hypothesis 1 - This observation is a freak weather event
Hypothesis 2 - The ozone hole is caused by human activity
What is a scientific theory?
- A basic statement that is supported by many observations and experiments
Cell theory-1600’s - Hooke looked at cork and identified cells
-Shortly afterwards Leeuwenhoek observed many single celled organisms in pond water
-1839 - Schleiden and Schwann formalized “cell theory”
-All living organisms are made of cells
-All cells come from other cells
Theory of heredity-Genes are inherited from parent to offspring in discrete units (Mendel)
-Chromosomal theory of inheritance - Genes reside on chromosomes, which are physically inherited
Characteristics of life - Homeostasis
Homeostasis is the maintenance of a controlled internal environment
Characteristics of life - Growth
-Cells grow by adding mass
-Large cells divide into multiple smaller cells
-Multicellular organisms grow by adding cells