Review Chi-Square Analysis: Mendel's monohybrid and dihybrid ratios are predictions based on the following assumptions: 1.Each allele is dominant or recessive 2.Random segregation of alleles 3.Independent assortment 4.Fertilization is random NOTE: *The outcomes of 2-4 are chance events and are subject to random fluctuation *As sample size increases, the average deviation from expected results decreases Establishing a null hypothesis (H 0 ): States that there is no difference between the observed and expected data An Example (for a monohybrid cross): The observed phenotypic ratio is 3:1
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