Question

250 45. Record your results below. Number of purple, smooth kernels Number of purple, wrinkled kernels Number of yellow, smooth kernels - Number of yellow, wrinkled kernels 46. What are the phenotypes of the Fz generation? a 92 se = 495 of the Fı generation 47. What are the genotypes of the F2 generation? Of the Fı generation 48. How do the observed phenotypes of your ear of corn compare with the expected F2 ratio? To calculate your expected ratio numbers given the total number of corn kernels that you counted use the following steps: A. Determine your expected ratio. For a dihybrid cross between two F: plants, both heterozygous for both traits, you would expect a 9:3:3:1 ratio. If you add 9+3+3+1, it equals 16. Therefore, each category is a fraction of 16. This means that you expect the following fractions 9/16, 3/16, 3/16, 1/16 for each phenotypic class. B. Determine your total number of corn kernels actually counted. C. Multiple each fraction by the total number of corn kernels actually counted. a. For example, if you counted 215 kernels, you would expect the following: i. 9/16 X 215 = 121 dominant phenotype for both traits ii. 3/16 X 215 = 40 dominant phenotype for 1 trait and recessive phenotype for other trait Ill. 3/16 X 215 = 40 dominant phenotype for 1 trait and recessive phenotype for other trait iv. 1/16 X 215 = 14 recessive phenotype for both traits D. Add the 4 resulting numbers to verify that they add up to your total number E. Compare the 4 resulting numbers (your expected numbers) to your actual numbers using Chi Square statistical analysis to be completed later in Part C). Now record the collective results for the entire class for all of the ears examined. Number of purple, smooth grains 2.CB Number of purple, wrinkled grains8 9) Number of yellow, smooth grains_LO14 Number of yellow, wrinkled grains_ 433 Observed phenotypic ratio of the F2 generation 49. How do these results compare with the expected Fz ratio? 50. Explain any difference between the answer for the class data and the answer for a single ear of corn.

Answer 1

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