(2) Flower organ pattern formation is specified by the so-called A, B and C genes in Arabidopsis. A gene alone makes sepal, A and B together make petal, B and C together make stamen, and C alone makes carpel. Furthermore, A and C are mutually antagonistic. If there is a double mutant of B and C genes, what will be the expected phenotype? A) All sepals B) All petals C) All stamens D) All carpels E) None of the above
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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?
Suppose a flower had normal expression of genes A and C and expression of gene B in all four whorls. Based on the ABC hypothesis, what would be the structure of that flower, starting at the outermost whorl? (A) carpel-petal-petal-carpel (B) petal-petal-stamen-stamen (C) sepal-carpel-carpel-sepal (D) sepal-sepal-carpel-carpel
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32.1 Reproductive Development and Structure Which is true of angiosperm flower structure? A. Most flowers are made up of four whorls, the outermost being the calyx B. The carpel of a flower is a component of the androecium C. If a species usually produces flowers with 5 petals but occasionally produces flowers with 4 petals, the 4 petal flowers are known as "incomplete" D. A "perfect" flower must have petals and sepals E. A "superior" flower is one where the ovary is found below the other flower parts
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