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(Solved): The shape of eggplant is determined by two independently assorting loci. Eggplants occur in 3 shapes ...



The shape of eggplant is determined by two independently assorting loci. Eggplants occur in 3 shapes: oval, bulbous, and long. A plant with long fruit is crossed with a plant with oval fruit. Both of these plants come from different pure-breeding lines and produce an F 1 consisting entirely of plants with long fruit. Crossing two F 1 plants produces seed which grow into 300 F 2 plants, of which 21 have oval fruit, 105 have bulbous fruit, and the remainder have long fruit. Based on the outcomes of these two crosses, find the phenotypic ratio for the F2 (2 pts), the F 2 genotypes (2 pts) and describe the interaction between the two loci (2 pts). Assume that complete dominance operates at each of the loci involved in determining this trait. b. The expression of ABO antigens depends on alleles at the H locus. A dominant allele (H) at the H locus encodes an enzyme that makes compound H, which is needed to produce ABO antigens. The recessive allele (h) encodes a defective enzyme that is incapable of making compound H. Based on this information and the ABO phenotypes, determine the ABO and H genotypes for each of the six members of this extended family. Use “?” for any alleles that cannot be determined. (6 pts, 1 pt per two-loci genotype) Man: Woman: Man’s mother: Man’s father: Daughter: Son: : c. Of the two loci for ABO and H, which is epistatic and what type of epistasis occurs? Explain the epistasis. (3 pts: 1pt epi locus, 2pts epistasis type and explanation)



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