Name __________________________ Bozeman A Beginners Guide to Punnett Squares Directions: Watch the Paul Anderson video showing how to do punnett squares using the following website. Answer the related questions to follow. http://www.bozemanscience.com/beginners-guide-to-punnett-squares/ 1. The two sides of a punnett square represent ___________? 2. The boxes on a punnett square represent ________________? 3. In a monohybrid cross, a homozygous purple plant is crossed with a homozygous recessive white plant. What are the gametes of each parent? _____ ______ x _______ ______ Show the possible outcomes of the punnett square. 4. What are the possible outcomes of crossing two heterozygous purple flowered pea plants? Genotypic ratio ______________________ Phenotypic ratio _______________ 5. Incomplete dominance shows only dominant alleles, which come together to give a third phenotype. What would be the result of crossing a pink (RW) with another pink (RW) flower? 6. In sex-linked genes, females are XX and males are XY. If a mom is a carrier for colorblindness, and the dad is a normal male, how many of their children would be colorblind? What is the sex of the colorblind child? 7. In a dihybrid cross that Mr. Anderson shows: a. Write down what R and r mean in pea plants, b. Write down what Y and y represent in pea plants. c. What are the genes produced by a plant that is RrYy? d. Complete a 16-box punnett square to show the outcomes of crossing two plants that are both heterozygous for the R and Y genes. e. What is the phenotypic ratio of the offspring? 8. Cross RrYy x rryy using a 16-box punnett square to show the results. How can you take a short cut on the 16-box grid?