Q Mendel used Punnett Squares as a mathematical way to predict genotypic and phenotypic ratios in his simple inheritance crosses. You will now utilize Punnett Squares to determine genotypic and phenotypic ratios in monohybrid (considering one trait) and dihybrid crosses (considering two traits at a time.) In order to answer questions regarding dihybrid crosses you will need to review the product rule. Note that genotypic and phenotypic ratios are NOT always the same. Genotypes will always allow us to predict phenotypes, but phenotypes cannot always reveal genotypes. Following the instructions found in the Genetics Worksheet Download Genetics Worksheet[DOCX file size 1.1 MB], you will submit your answers to the questions found there. At times you will use forward genetics (use the parental alleles to determine the offspring’s phenotypes). Other times you may need to consider the offspring’s alleles to determine the parental genotypes. Watch the video “Genetics: Trihybrid Cross: The Forked Line Method” in your assigned videos for a demo of the “forked line” method for using a diagram-approach to keep track of the probabilities (especially useful when working with three or more traits). Compose your work using a word processor (such as Microsoft Word, etc.) and save it frequently to your computer. Check your work and correct any spelling or grammatical errors. When you are ready to submit your work, click “Submit Assignment” in the upper right corner. Click on “Browse,” browse your computer, and select your file. Click “Open” and verify the correct file name has appeared next to the Browse button. Enter your comments, if any, in the Comments area. Click on “Submit Assignment.”