The ABC model of flower development, explains how floral organs are specified by combinations of A, B, and C functions acting in different whorls. AP1 and AP2 are A function genes, AP3 and PI are B function genes, and AG is a C function gene. The sketch with the "box diagram" of A B C functions shows how floral organs are specified in a WT plant which has Se, Pe, St and Ca in whorls 1, 2, 3 and 4, respectively.
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a Flower parts are arranged in four concentric circles: sepals, petals, stamens, and carpel. According to the ABC model of floral organ development in Arabidopsis, class A genes are needed to specify sepals, the A and B genes to specify petals, the B and C genes to specify stamens, and class C genes to specify the carpel. If a mutation occurs in one of the B genes, rendering it inactive, what will the resulting flowers consist of?
The figure on the right shows how the ABC hypothesis predicts the development of floral organs. a) Explain how genes A, B and C determines the fate of each whorl. b) If you produced a mutant which does not have the B gene, how do the 4 whorls develop? c) If you expressed B genes in whorls 1 and 4 in addition to 2 and 3, how do the whorls 1 and 4 develop?
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