01:119:116 Lecture Notes - Lecture 5: Filter Feeder, Choanoflagellate, Blastomere
14 Mar 2016
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Unikont diversity ii - lecture 5: characteristics of animals, heterotrophs: depend on producers, depend on producers, ingest food and digest in body, cell structure, eukaryotic, multicellular. 3. lack cell walls: proteins external to plasma membrane. Collagen: organization, all have differentiated cells, most have differentiated tissues. Group of cells with a common ancestor. Structure and act as a functional unit: higher forms have differentiated organs specialized structures made up of tissues, have muscle and nerve tissue. 2n stage dominant in life cycle: meiosis - haploid egg and sperm. Archenteron: pouch formed by gastrulation: opens to outside via blastopore, some animals develop directly into adults, other animals have at least 1 larvae stage larva: sexually immature form. 2 larva will undergo metamorphosis: develop into a juvenile - sexually immature -> into adult, development regulated by gene expression. Homeobox genes: genes that code for proteins that regulate expression of developmental genes. 3: the metazoas are a monophyletic group.
