BICD 100 Lecture Notes - Lecture 2: Chi-Squared Distribution, Mendelian Inheritance, Punnett Square
10 Jan 2019
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Crossed yellow and round peas with green and wrinkled peas. F2 self-fertilized generation gets 9/16 y/r, 2/16 y/w, 3/16 g/r, and 1/16 g/w. Now we can get new combinations like yellow and wrinkled and green and round. During gamete function, segregating pairs of unit factors (genes) assort independently of each other. Each postulate has its exceptions so is not necessarily always true. Draw a punnett square of a ggww xggww dihybrid cross. Now we can see the 9:3:3:1 ratio present with a heterozygous dihybrid cross. The above ratio is phenotypic but the genotypic ratio is more complicated. When two independent events occur simultaneously, the combined probability of the 2 outcomes is equal to the product of their individual probabilities. p(a and b) = p(a)*p(b) Taking real-life data and deciding if it fits your genetic hypothesis. Chi-square analysis evaluates the influence of chance on data. Statistical test to check your experimental results against expected ratios.
