In a plant that conformed to the ABC model of floral develop

In a plant that conformed to the ABC model of floral development, what would be the most likely consequence of a mutation that disabled the B genes?

The plant would not flowers

The plant would flower but the stamens and carpels would be missing

The plant would flower but the stamens and carpels would be replaced by petals

The plant would flower but would have 2 whorls of sepals surrounding 2 whorls of carpels

Solution

Answer: The plant would flower but would have 2 whorls of sepals surrounding 2 whorls of carpels

Reason:

ABC model of flower development –Inactivated gene ”B” and gene “A”: Consider a model in which genes A, B and C determining the development of flower associated reproductive organs such as 4 flower whorls of organs include sepals, petals, stamens and carpels. Class B genes inactivation via mutation is in a plant that conformed to the ABC model of floral development, the mutation in this assignment is leading to generation of sepals in whorl 2 (replaces petals) & “generation of unfused carpels in whorl 3 of the flower formation” (replaces stamens). Finally, it can be observed that the pattern of organs in the manner “sepal, sepal”, “carpel, carpel”. The plant would flower but would have 2 whorls of sepals surrounding 2 whorls of carpels