Three questions 1. How is dorsal-ventral(D-V背腹)cll differentiation regulated by morphogen 形态发 生素) gradients 梯度)∵BMP(骨形态发生 蛋白) signal transduction 2. Hox is the the antero- posterior(A-P前后) pattern regulated by hox genes? Colinearity(共线性) Activation by retinoic acid(视黄酸) Retinoid receptors. 3. How have conserved(保守) gene networks affected Evolution and development? Evo-DevoThree questions: 1. How is dorsal-ventral (D-V背腹 ) cell differentiation regulated by morphogen（形态发 生素）gradients（梯度）. BMP（骨形态发生 蛋白） signal transduction. 2. Hox is the the antero-posterior (A-P前后 ) pattern regulated by Hox genes? - Colinearity（共线性） - Activation by retinoic acid（视黄酸）. Retinoid receptors. 3. How have conserved（保守）gene networks affected Evolution and Development? Evo-Devo