BLG 143 Chapter Notes - Chapter 21: Apoptosis, Evolutionary Developmental Biology, Homeosis
Document Summary
Hypotheses: cells express different genes because they contain different genes, all the cells in a body contain the same genes buy express only a specialized subset, plants, cells can de differentiate to form other plant parts, cells must contain the genes required by all different types of plant cells, animals. Spatial location is determined by three major body axes: anterior (toward the head), posterior (toward the tail, ventral (toward the belly), dorsal (toward the back, left and right, master regulators, pattern formation: series of events that determine spatial organization of embryo, early signals act as master regulators. Series of signals arrive and activate genes that specify finer and finer control over cell fate: pattern formation mutants, genetic research in the 1970s, development of the fruit fly (drosophila melanogaster, nusslein volhard and colleagues discovered less than 100 genes with fundamental roles in pattern formation via use of mutant embryos.
