BIOSC-101 Lecture Notes - Lecture 24: Theodosius Dobzhansky, Dependent And Independent Variables, Selective Breeding
21 Dec 2020
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Scientific method: make an observation (of pattern in nature) a question, formulate a hypothesis (educated guess/possible explanation for the pattern based on knowledge and earlier research)- not prediction. A influences b: experiment via two approaches: manipulative experiment or. Correlational/observational approach: results: data analysis (t-test or x2 test, conclusion: drawn about hypothesis based on results. If unsupported, another hypothesis must be drawn and steps 2-5 are repeated. A influences b as a is the independent variable while b is the dependent variable. Therefore, variation in a causes variation in b as variable a influences variable b. Two approaches to an experiment : manipulative (experimental) approach: e. g. Greenhouse increase temperature as treatments of a are manipulated. Cost of correlational approach: more challenging to examine. There is always some level of uncertainty due to variation, but we use it to gain evidence. Nothing in biology makes sense, except in the light of evolution. -dobzhansky.
