To study the brassinosteroid (BR) signal transduction pathway, you identify mutations that affect the ability of BR to induce stem elongation. You...

Plant Biology Question: To study the brassinosteroid (BR) signal transduction pathway, you identify mutation.. (reference picture)

1.To study the brassinosteroid (BR) signal transductionpathway, you identify mutations that affect the ability ofBR to induce stem elongation. You identify fourrecessive mutations designated b, r, a, and s.MutationMutant PhenotypeObservationsbInsensitive to BRB encodes a BR binding proteinrConstitutive BR responseR encodes a protein with sequencesimilarity to a Raf kinaseaInsensitive to BRA encodes a transcription factorSConstitutive BR responseS protein binds promoter of gene ArsConstitutive BR responseabInsensitive to BRarInsensitive to BRasInsensitive to BRBased on all of the information, describe the order in which B,R, A, and S operate in the signal transduction pathway.Describe how the signal transduction pathway operate in thepresence and absence of BR. Explain your answer.