34. What are the possible genotypes of the progeny?.What are the phenotypes of the progeny?.c. The F1 plants of problem b above are self-pollinated. (For this problem, assume that nocrossing-over has taken place.)35. What alleles will their gametes carry? eggs36. What are the genotypes of the F2 population?.What are the phenotypes of the F2 population?_spermPart B Maize Genetics Aleurone Color and Endosperm CharacteristicsIn the corn grain, the aleurone layer is a single layer of cells between the pericarp and theendosperm. The color of the aleurone layer is determined by several interacting genes, one ofwhich, R, is responsible for anthocyanin production in the aleurone layer. Homozygous dominant(RR) and heterozygous (Rr) genotypes result in a purple aleurone layer and the homozygousrecessive (rr) genotype results in a colorless one. The grains will appear either purple or yellowrather than purple or colorless as you might expect. The yellow is due to the presence of yellowendosperm below the colorless, transparent aleurone layer.The allele Su produces starchy endosperm and the allele su produces sweet endosperm.Su is completely dominant over su. When the kernels dry, SuSu and Susu grains are smooth, whilesusu grains are wrinkled.Predict what phenotypic ratio of purple-smooth; purple-wrinkled; yellow-smooth;yellow-wrinkled kernels you expect to observe.37. What is your expected dihybrid F2 phenotypic ratio.38. What is your null hypothesis?I tol39. What is your alternative hypothesis?71 Dihybrid Cross:Examine an ear of corn representing an F2 generation. Do not remove any grains fromthe ears of corn, do not remove the plastic sleeves that cover the ears, and please handlethe ears carefully. If you wish, you can use a very small piece of masking tape at one of the earto keep track of the rows as you count the grains. Do not count all of the purple and then returnto count all of the yellow. This will lead to some grains being counted twice and some not beingcounted at all. Rather, examine each grain one at a time and determine if it is purple or yellowand if it is wrinkled or smooth. Work with your lab partner. One person can call out thephenotype while the other person records the phenotype. If you are unsure how to categorizeparticular grains, you may consult your lab instructor.40. Record your results below.Number of purple, smooth kernels 5Number of purple, wrinkled kernelsNumber of yellow, smooth kernelsNumber of yellow, wrinkled kernels.11841. What are the phenotypes of the F2 generation?Of the F1 generation.42. What are the genotypes of the F2 generation?Of the generation43. 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 youcounted use the following steps:A. Determine your expected ratio. For a dihybrid cross between two F₁ plants, bothheterozygous for both traits, you would expect a 9:3:3:1 ratio. If you add 9+3+3+1, itequals 16. Therefore, each category is a fraction of 16. This means that you expect the 2following 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 traitsii. 3/16 X 215 = 40 dominant phenotype for 1 trait and recessive phenotypefor other traitiii.3/16 X 215 = 40 dominant phenotype for 1 trait and recessive phenotypefor other traitiv. 1/16 X 215 = 14 recessive phenotype for both traits oD. Add the 4 resulting numbers to verify that they add up to your total numberE. Compare the 4 resulting numbers (your expected numbers) to your actual numbers usingChi Square statistical analysis (to be completed later in Exercise III).72

Question

Accepted Answer

Given:
R - Purple colour
r - Colourless
Su - Starchy endosperm ( smooth)
su - sweet endosperm ( dry…