Biology 111 Lab Practical :P
: all organisms are made of cells that store hereditary information in DNA.
: DNA sequences may be altered by mutation or by crossing over and
segregation during meiosis.
Theory of heredity
: changes in DNA sequence produce individual, heritable variation.
Theory of evolution
: changes in DNA resulting in a more “fit” individual are passed
down in greater numbers to the next generation, etc.
genetic change over time.
observe a phenomenon and formulate questions
reflect on implications
propose a hypothesis
test the hypothesis
analyze the results
support, reject, or modify the hypothesis
Difference between compound and dissecting microscopes:
Dissecting use transmitted AND reflected light where as compound only uses transmitted.
Dissecting is good for large, 3-d, opaque specimens.
Dissecting has a lower
magnification but a greater resolution compared to compound.
Microscopes in general: as you move from higher to lower power, resolution increases