Example - BGBB BBGB BBBG GGGB GGBG GBGG BGGG GGBB GBGB BGBG...

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Example: P(H1T2 or H2T1)= In genetics, we often apply the addition rule without realizing: • Aa x Aa → • Another genetic example involves dihybrid crosses y = 0, P = 1/16 y = 1, P = 4/16 y = 2, P = 6/16 y = 3, P = 4/16 y = 4, P = 1/16 It may help to realize there are 16 possible outcomes (24, because 2 sexes, 4 births), and that while there is only one outcome that is all boys and only one outcome that is all girls, there are 4 possible outcomes with one girl (first baby girl, or second baby girl, etc), and so on. Figure 1.1 Binomial distribution of 4 girls and boys BBBB GBBB GGGG
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Unformatted text preview: BGBB BBGB BBBG GGGB GGBG GBGG BGGG GGBB GBGB BGBG GBBG BGGB BBGG 0 1 2 3 4 1/16 2/16 3/16 4/16 5/16 6/16 5 possible events: y number of successes 16 possible outcomes Lab Topic 1 8 2. Poisson Distribution The Poisson distribution expresses the probability of the number of events in a given period of time or sample size, based on a known average frequency. When the average probability (p) of an event is rare (such as a specific mutation) in the sample size (such as a large region of DNA or many DNAs), the Poisson distribution becomes useful. The...
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This note was uploaded on 02/23/2010 for the course BIOL 223 taught by Professor Smithanddarwiche during the Spring '10 term at American University of Beirut.

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