BIOL 2301 Lecture Notes - Lecture 9: Phenotype, Binomial Distribution, Mutual Exclusivity
6 Sep 2016
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Genetic transmission includes a large element of chance. Lecture 9 notes: what alleles end up in gamete, which gametes come together in fertilization. We can"t predict exact outcomes, but we can calculate probability. Random means we don"t know what factors are affecting the outcome: doesn"t mean it"s actually random-we just don"t know. A general rule for repeated trials of mutually exclusive events with constant probabilities. Have: each children independent events- multiply, two normal and one affected: 8 possibilities: 23 cases (have or not), 3 children. Not 3/8 because odds of being affected aren"t 50/50- its . Binomial probability calculator: don"t need to memorize- will be provided at back of exam (variables will be give as well, factorial: multiplication of numbers leading up to that number. Most numbers we have used so far are made up and turn out exact. Parents: ww x ww: 99 w, 45 ww.
