Assignment
• Explain how communication within or between cells regulates gene expression in the following cases:
• - Cytokines regulate gene expression to allow for cell replication and division.
• - Mating pheromones in yeast trigger mating gene expression.
• - Levels of cAMP regulate metabolic gene expression in bacteria.
• - Expression of the SRY gene triggers male sexual development pathway in animals.
• - Ethylene levels regulate production of different enzymes, allowing fruits to ripen.
• - Seed germination and gibberellin.
• Explain how signal pathways mediate gene expression, including how this process can affect protein production in:
• - Mating pheromones in yeast trigger mating genes expression and sexual reproduction.
• - Morphogens stimulate cell differentiation and development.
• - Changes in p53 activity can result in cancer.
• - HOX genes and their role in development.