Final answer:
When predicting or analyzing genetic outcomes, two factors to keep in mind are the multigenic pattern of inheritance and the influence of chance and small sample size.
Step-by-step explanation:
When predicting or analyzing genetic outcomes, there are two factors to keep in mind. The first factor is the understanding that most diseases have a multigenic pattern of inheritance, meaning they are influenced by multiple genes and environmental factors. This means that examining the genotypes or phenotypes of a person's parents will only provide limited information about the risk of inheriting a disease. The second factor is the influence of chance and variability resulting from a small sample size. Unlike Mendel's experiments with thousands of pea plants, human couples do not have thousands of children, so the actual outcomes may deviate from the predicted ratios due to chance.