Respuesta :
The correct answer is option (B) thus Based on the ABC hypothesis, the structure of that flower, starting at the outermost whorl will be petal-petal-stamen-stamen.
Sets of highly modified leaves placed in whorls make up flowers. The calyx, or the outermost whorl of a flower, is made up of sepals. The corolla, which is made up of petals, is located inside the calyx. Though this generalization can be misleading, the sepals are frequently smaller and less colorful than the petals. Lilies, for instance, frequently have matching sepals and petals. The androecium (home of man), a whorl made of stamens, is located inside the perianth. Long filaments on each stamen support pollen sacs known as anthers. The gynoecium, or "home of the lady," is located inside the androecium and is made up of carpels. Ovules are contained in an ovary at the base of each carpel. The stigma is placed on top of the style when it leaves the ovary. To reach the ovule and complete fertilization, pollen grains must travel down the style in the form of a tube after landing on the stigma.
The complete question is:
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-carpe
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The structure of that flower would be petal-petal-stamen-stamen, beginning at the outermost whorl.
The A and C genes are positioned normally in the given circumstance, however, the B gene is present in all four whorls. A petal will form in the first whorl if both the A and B genes are present, and another petal will form in the second whorl.
Given the presence of both B and C genes, the third and fourth whorls will develop into stamen.
Thus, the flower's structure will be petal-petal-stamen-stamen given the circumstances.
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