Metazoan Origins: Evolution, Development, and Phylogenetics, Slides of Genetics

Download Metazoan Origins: Evolution, Development, and Phylogenetics and more Slides Genetics in PDF only on Docsity! Lecture 11 • Evolution and Development • Animal development • Phylogenetics: terms and analysis Docsity.com Evolution: explanation for the diversity of life/form. Development: generation of form. Evo Devo is the synthesis of these. Docsity.com Metazoan origins Three techniques used A) examine living organisms B) examine the fossil record C) examine DNA sequence Docsity.com Metazoan origins Considerations when looking at the living A Divergence vs convergence Docsity.com Metazoan origins Considerations when looking at the living A Divergence vs convergence Human and Squid camera eyes Docsity.com Evolution of a chitin exoskeleton Polyphylogeny Monophylogeny Proto-platyhelminthes No exoskeleton Insects Crustacea Spiders Insects Crustacea Spiders Common ancestor with an exoskeleton Docsity.com Metazoan origins Considerations when looking at the living A Divergence vs convergence B Polyphylogeny vs monophylogeny C time blurs all origins Docsity.com Metazoan origins Considerations when looking at the living A Divergence vs convergence B Polyphylogeny vs monophylogeny C time D data set in the present Docsity.com 0 300 600 900 1200 Protostome/ Deuterostome split Chordata Chordata Mullusca Mullusca Cambrian Vendian Molecular clock analysis Docsity.com 0 300 600 900 1200 Chordata Mullusca Cambrian Vendian Molecular clock Biomarker analysis Protostome/ Deuterostome split Docsity.com A complex organism existed at the protostome deuterostome split Carroll et al., From DNA to diversity Docsity.com