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10.6 Monohybrid and Dihybrid Crosses Assignment Part 1 Traits are physical characteristics that are inherited, such as hair color or eye color. Gregor Mendel used monohybrid crosses to predict how traits are transferred from parents to offspring. A cross between parents differing in only one trait is called a monohybrid cross because mono means “one.” A cross between parents differing in two traits is called a dihybrid cross because di means “two.” The Genetics PowerPoint shows the steps to completing a monohybrid cross and determining the possible traits of the offspring. Visit the following online tutorial to review the steps involved in a monohybrid cross. The Biology Project-Mendelian Genetics -Monohybrid Cross Tutorial http://www.biology.arizona.edu/mendelian_genetics/problem_sets/Monohybrid_cr oss/01t.html Part 2 Gregor Mendel also used dihybrid crosses to predict how traits are transferred from parents to offspring. A cross between parents differing in two traits is called a dihybrid cross because di means “two.” Visit the following online tutorial to learn the steps involved in a dihybrid cross. The Biology Project-Mendelian Genetics -Dihybrid Cross Tutorial http://www.biology.arizona.edu/mendelian_genetics/problem_sets/Dihybrid_cross /03t.html Write down the steps as you are going through the tutorial. Note: You will be responsible for filling in a dihybrid cross on the quiz, so pay attention! Steps for dihybrid cross (the first word of each step has been written in for you so you know what the step is in the tutorial): 1. Draw… 2. List… 3. Fill… 4. Fill… Part 3 5. The following is a cross between two pea plants. Fill in the punnett square and answer the questions. R = round, r = wrinkled, Y = yellow, y = green. RY Ry rY ry RY Ry rY Genotype: RYry phenotype: yellow and round ry 6. Is this a monohybrid or a dihybrid cross? 7. What are the two dominant alleles? What are the two recessive alleles? Examine the offspring in the shaded square. 8. What is the genotype? 9. What is the phenotype?
