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Cross 1: In corn, the gene for colored (A) seeds is completely dominant to the gene for colorless (a) seeds.
Cross 1: In corn, the gene for colored (A) seeds is completely dominant to the gene for colorless (a) seeds. Similarly a single gene pair controls whether the endosperm (the part of the seed that contains the food stored for the embryo) is full or shrunken. Full (B) is dominant to shrunken (b). A truebreeding colored, full-seeded plant was crossed with a colorless, shrunken-seeded one. The F1 colored, full plants were crossed to a colorless and shrunken tester strain (recessive for both genes). The results were as follows: colored and full 1500 , colored and shrunken 80 , colorless and full 75, colorless and shrunken 1550
a. The two genes appear to be linked. Briefly explain how you can tell, you do not have to justify using the Chi-square test. Show the inferred chromosomal constitutions of the parents.
b. What is the Umap distanceU between the seed color gene (A) and the endosperm gene (B)? Show the linkage arrangement of the endosperm shape and seed color alleles on the involved homologous chromosome pair in the F1, the tester strain, and the F2 as part of your answer. Indicate which of the F2 are parental and which are recombinant.
Cross 2: Another cross was performed between two purebred parents of unknown phenotypes. The F1 were crossed to a tester strain and the following progeny were scored in the F2 generation. F2 Phenotype Number: colored, full 920 colored, shrunken 15,800 colorless, full 16,000 colorless, shrunken 900
c. Show the inferred chromosomal constitutions of the parents.
d. What is the Umap distanceU between the seed color gene (A) and the endosperm gene (B) in this new cross? Show the linkage arrangement of the endosperm shape and seed color alleles on the involved homologous chromosome pair in the F1, the tester strain, and the F2 as part of your answer. Indicate which of the F2 are parental and which are recombinant.
