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Name: _____________________________________ 1. Given that in corn (Zea maize) purple grain is dominant to yellow grain. Explain your answer without using a genetic diagram. class: _________ class no:____ Work out the genotype of the ears. (Work example) Let P be the allele for purple grain and p be that for yellow grain The genotype of the yellow ear parent is pp. Since yellow is recessive to purple The genotype of the purple ear parent is PP. All the F1 is purple, the yellow parent will only provide an p allele to the F1. Thus they must have received one purple allele from their purple parent. Since all F1 are purple, the Purple parent should be homozygous PP. The F1 are heterozygous (Pp) since their parents are homozygous. In the F2 the, the phenotypic ratio is 62 purple : 19 yellow (3 rows) ~ 3 : 1 The monohybrid ratio is consistent with the expectation of a F1 heterozygous interbreed result. 2. Given that in corn (Zea maize) smooth grain is dominant to wrinkled grain. P F1 X F1 F2 Work out the genotype of the ear. Explain your answer. 3. Given that in corn (Zea maize) smooth grain is dominant to wrinkled grain and purple is dominant to yellow. genetic diagram. Work out the genotypes of the ear. Explain your answer with a purple/smooth = yellow/smooth = purple/wrinkled = yellow/wrinkled = 4. Further examples in corn genetics: Ear Observed number and ratio Suggest possible parent genotypes Ear A Ear A purple = 378 yellow = 122 3 purple 1 yellow Rr x Rr Ear B Ear B 1 purple purple = 247 1 yellow yellow = 253 Rr x rr purple = 247 yellow = 253 Ear C Ear D Ear C 1 purple smooth purple/smooth = 124 1 purple wrinkled yellow/smooth = 123 1 yellow smooth purple/wrinkled = 127 1 yellow wrinkled yellow/wrinkled = 123 Rr Stst x rr stst Ear D Rr Stst x Rr Stst purple/smooth = 280 yellow/smooth = 93 purple/wrinkled = 95 yellow/wrinkled = 32 5. Interpretation of dihybrid test cross result: Phenotype of offspring Genotype of unknown pea plant with round and yeoolw seeds All Round and yellow Round yellow to Round green = 1:1 Round yellow to Wrinkled yellow = 1:1 Round Yellow / Round green / Winkled yellow / wrinkled green = 1:1:1:1 6. More genetic problems i) ii) 6. ans