Problem 3: A genetic cross yielding a 9:3:3:1 ratio of offspring.
Which of the following genetic crosses would be predicted to give a phenotypic ratio of 9:3:3:1?
A. SSYY x ssyyAll offspring would have genotype of SsYy and a phenotype dominant for both traits (spherical, yello-seeded plants.)
D. SSyy x ssYY
All offspring would inherit dominant S allele from first parent and dominant Y allele from sedonc parent. All offspring would have genotype of SsYy and a phenotype dominant for both traits (spherical, yellow-seeded palnts.)
E. ssYY x ssyy
All offspring would have the genotype ssYy and a phenotype of dented, yellow-seeded plants.
University of Arizona
Tuesday, August 13, 1996
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