Biology 1001A Chapter Notes - Chapter 10.1B: Dihybrid Cross, Punnett Square, Product Rule
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10. 1b the beginning of genetics: mendel"s garden peas. 10. 1d mendel could predict both classes and proportions of offspring from his. Mendel used probability to make his predictions. When two or more events are independent, the probability that they will both occur is calculated using the product rule their individual probabilities are multiplied. The sum rule is applied when several different events all give the same outcome. 10. 1e mendel used a testcross to check the validity of his hypotheses. Mendel realized that he could assess the validity of his hypotheses by determining whether they could be used successfully to predict the outcome of a cross of a different type than he had tried so far. He crossed an f1 plant with purple flowers (pp) with one with white flowers (pp) and his predicted probabilities were extremely close to his experimental probabilities. A cross between an individual with the dominant phenotype and a homozygous recessive individual is called a testcross.
