http://animoto.com/play/19FpJMW7BW0tNSqA1LfnFw
- wild type normal nature, not mutated
- mutate quickly
- What is the chi square test used for?
- statistical test that makes a comparison between the data collected in an experiment versus the date you expected to find
- chi square test is a way to evaluate this variability to get an idea of the difference between real and expected results are due to normal random chance
- or if there is some other factor involved (like an unbalanced coin or a different inheritance scheme than the one you predicted
Why is probability important to genetics?
- classical genetics research where you are trying to determine the inheritance pattern of a phenotype --> establish a predicted genetic explanation and expected phenotype rations in the offspring (from Punnett square) = null hypothesis
- compare observed results against your genetic hypothesis (Punnett square)
A geneticist crossed wild gray-colored mice with white (albino) mice. All the progeny were gray. These progeny were intercrossed to produce an f2 which consisted of 198 gray and 72 white mice. Propose a hypothesis to explain.
http://images.google.com/imgres?imgurl=http://insects.eugenes.org/species/about/species-gallery/Drosophila_melanogaster/Drosophila_melanogaster.jpg&imgrefurl=http://insects.eugenes.org/species/about/species-gallery/Drosophila_melanogaster/&usg=__BBVbWH2EwV9sRuZHB9m7zaEloGU=&h=1152&w=1728&sz=96&hl=en&start=2&um=1&itbs=1&tbnid=L-xJGZ5q0ywqsM:&tbnh=100&tbnw=150&prev=/images%3Fq%3Ddrosophila%26hl%3Den%26client%3Dsafari%26rls%3Den%26sa%3DX%26um%3D1
http://celebritygeckos.com/Portals/28/Genetics/Genetics/basicpunnetsquare.JPG
http://www.stat.lsu.edu/exstweb/statlab/Tables/chi-dist-5df.jpg
http://www.geography-site.co.uk/pages/skills/fieldwork/statimage/chisqu.gif
http://faculty.southwest.tn.edu/jiwilliams/probab2.gif
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