BIOL 1001 Study Guide - Final Guide: Flattening, Burgess Shale, Autotroph

• School: York University
• Department: Biology
• Course: BIOL 1001
• Professor: Tamara Kelly

Document Summary

Cell-cell signals trigger differential gene expression: three body axis, anterior (front of body) posterior (back of body, ventral (toward belly) dorsal (toward back, one axis runs left to right. Cell cell signals tell cells where they are in time and space: this information activates transcription factors that turn specific genes on or off, resulting in differentiation. Master regulators set up the major body axes. Pattern formation term that biologists use to describe the events that determine the spatial organization of an embryo. In situ hybridization works by adding a label to single-stranded copies of dna or rna molecules. Is produced in meristematic cells at the tip, or apex, of the growing embryo and is transported toward the base. They provide cells with information about their position along the anterior-posterior or the apical-basal body axis. Segment a region of an animal body that contains a distinct set of structures and is repeated along its length.