Question

Plant Biology: Gibberellic acid (GA), is a hormone that promotes seed germination. The following... (reference picture- note explain clearly)

Gibberellic acid (GA), is a hormone that promotes seed germination. The following recessive mutations affect the GA signal transduction pathway: gid (ga insensitive dwarf), sly (sleepy), gai (ga insensitive), wg (weak germination) The following information is provided about the mutations and genes Germination without GA Germination with GA Mutation Observations none (wild type plant wild type GID protein binds GA gi sl wild type SLY protein is a E3 ubiquitin ligas ai +I- (weak) wg sly gai gai wg hich of the above genes act to promote seed germination? Which genes act to inhibit seed germination? Describe the order of the genes in the pathway. Assume that they all operate in a single pathwav. Briefly justify your answers. Describe the signal transduction pathway operated by the above genes to control seed germination in the presence of GA, and in the absence of GA. Explain your answer. Use the symbols for positive regulation and the symbol --| for negative regulation, of the immediately downstream gene or protein in the pathway.

Answer 1

2) sy 3) G10 o GA SAI GAI Sy Ws