Biology 3593B Study Guide - Quiz Guide: Blastula, Gastrulation, Tyrosine
Document Summary
Basic machinery of development is essentially the same in all animals; differences in shape. Misexpression of proteins can induce abnormal development in other parts of the animal embryo. Homologous proteins can perform similar functions in other animals. 50% of genes have homologs in other species, most code for building blocks". Gastrulation: single-layered blastula is reorganized into a multi-layered structure; creating two structures endoderm layer, ectoderm layer and mesoderm cells in between. Stages of cell development: toti/pluripotent determination differentiation terminal differentiation. Expression of different transcription factors determine expression of specific genes. Changes in regulatory dna seems largely responsible for the differences between animal classes: moving a regulating gene -> different instructions transcription of same component. Building blocks are similar but how and when they are used an be different between cells and animals. Little difference between # genes humans and c. elegans.
