Organic chemistry janice smith problem 3.27

The probability distribution of the floral organ number within a population is usually asymmetric, i.e., it is more likely to increase rather than decrease from the modal value, or vice versa. Although the floral organ number is a hallmark of floral species, it can distribute stochastically even within an individual plant. Such morphological stochasticity is found in foral organ numbers. While the universal statistics and mechanisms underlying the stochasticity at the biochemical level have been widely analyzed, those at the morphological level have not. Intrinsic stochasticity in biochemical reactions underlies the typical intercellular distributions of chemical concentrations, e.g., morphogen gradients, which can give rise to stochastic morphogenesis.

Stochasticity ubiquitously inevitably appears at all levels from molecular traits to multicellular, morphological traits. Finally, genetic interactions that prevent flower formation and lead to the generation of filamentous structures implicate UFO as a member of a new, large, and diverse class of genes in Arabidopsis necessary for flower formation.ДЄ developmental basis for stochasticity in floral organ numbers In many respects, UFO acts in a manner similar to LEAFY, but the ufo mutant phenotype also suggests an additional role for UFO in defining boundaries within the floral primordia or controlling cell proliferation during floral organ growth. UFO is involved in establishing the whorled pattern of floral organs, controlling the determinacy of the floral meristem, and activating the APETALA3 and PISTILLATA genes required for petal and stamen identity.

UFO is required for the proper identity of the floral meristem and acts in three different aspects of the process that distinguishes flowers from shoots. We describe the role of the UNUSUAL FLORAL ORGANS (UFO) gene in Arabidopsis floral development based on a genetic and molecular characterization of the phenotypes of nine ufo alleles.

UFO: an Arabidopsis gene involved in both floral meristem and floral organ development.

Organic chemistry janice smith problem 3.27