BIOL-3030 Chapter Notes - Chapter 2: Chordate, Synapomorphy, Gastrulation
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Recap: synapomorphies defining features of a clade. Whether a trait is a synapomorphy depends on what group of animals you"re talking about. Doesn"t stay a synapomorphy throughout the entire lineage. Developmental starting from the zygote to the embryo to the adult organism. The closer the branch to the taxa you"re considering, the more related it is to that taxa than others. There are no more character states, those hashes are the names of the clades. Blastopore very first ingression of cells that form a pocket. The fate of the blastopore distinguishes the deuterostomes and protostomes. 1. stiff fibrous skeletal rod that runs along the body. 4. some kind of structure that allows the animal to bind iodine from the environment and bring it in your body. These features don"t have to be present in adults. This is why we are considered to be chordates and we don"t have a tail/pharyngeal pouches etc. In our embryonic stages those pouches and tails are present.
