Genetics_Study_Quiz__3

Genetics_Study_Quiz__3 - Genetics Study Quiz #3 1. 1. A...

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Genetics Study Quiz #3 1. 1. A phenotype ratio of 9:3:3:1 in the offspring of a mating of two organisms heterozygous for two traits is expected when: a. the genes reside on the same chromosome b. each gene contains two mutations c. the gene pairs assort independently during meiosis The parental organisms have the same phenotype, but their offspring have 4 different phenotypes. The 9: 3: 3: 1 ratio can only occur if the two traits assort independently during meiosis. d. only recessive traits are scored e. none of the above 2. Which of the following genetic crosses would be predicted to give a phenotypic ratio of 9:3:3:1? A. SSYY x ssyy All offspring would have genotype of SsYy and a phenotype dominant for both traits (spherical, yello-seeded plants.) B. SsYY x SSYy All offspring would have genotype of either SSYY, SSYy, SsYY, or SsYy, and a phenotype dominant for both traits (smooth, yellow-seeded plants.) C. SsYy x SsYy The dihybrid cross was invented by Mendel to discover the independent
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Genetics_Study_Quiz__3 - Genetics Study Quiz #3 1. 1. A...

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