PS1_Key - BICD100 Reinagel 2005 PROBLEM SET 1 Monohybrid...

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BICD100 Reinagel 2005 PROBLEM SET 1 Monohybrid Crosses ANSWER KEY 1. In Mendel's "Experiment 1," true breeding pea plants with spherical seeds were crossed with true breeding plants with dented seeds. (Spherical seeds are the dominant characteristic). Mendel collected the seeds from this cross, grew F1-generation plants, let them self-pollinate to form a second generation, and analyzed the seeds of the resulting F2 generation. a. What is the genotype of the F1 plant? Parents are SS and ss; the F1 plants are Ss b. What are the possible genotypes of the F1 plant’s seeds? In what ratio? S or s, 1:1 This question might have been a bit confusing. I should have said “gametes” c. What are the genotypes of the F2 generation plants? 1 SS : 2 Ss: 1 ss S s S SS Ss s Ss ss d. What percent spherical-seeded plants did he obtain in the F2 generation? “he” means Mendel… he got 5,471 spherical : 1850 dented or 74.74% e. What percentage would you predict? Both SS and Ss are spherical so based on ratios in part (c), 75% should be spherical. 2. When true-breeding pea plants with axial flowers are crossed with true-breeding pea plants with terminal flowers in Mendel’s experiments, a. Which trait was dominant, based on the F1 phenotype? Axial (distributed), see Mendel p.8 b. Based on your answer to (a), what fraction of the F2 plants are predicted to have axial
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This note was uploaded on 03/11/2009 for the course BICD bicd 100 taught by Professor Soowal during the Spring '08 term at UCSD.

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PS1_Key - BICD100 Reinagel 2005 PROBLEM SET 1 Monohybrid...

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