Week 3 notes
Popular in Biology of Organisms-Animals and Plants
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This 2 page Class Notes was uploaded by Isabel Hernandez on Thursday September 10, 2015. The Class Notes belongs to LIFE 103 at Colorado State University taught by Shane Kanatous; Graham Peers in Summer 2015. Since its upload, it has received 69 views. For similar materials see Biology of Organisms-Animals and Plants in Biology at Colorado State University.
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Date Created: 09/10/15
Chapter 32 Five characteristics of animals 1 Eukaryotic Multicellular take in food and digest it inside of body different stages in development in life cycle 9599 Muscle and nerve tissues a exaggerated motion and exaggerated control of body Role of Hox genes 0 control expressions of different genes 0 control cell differentiation which produces many features 0 body plan 0 timing and expression patterns make animals look different 0 duplication of Hox genes over time as organisms became more complicated History of animals 0 evidence of animals 1 billion years ago 0 molecular data comparing animals and choano agellates revealing rst changes in animals 0 Cambrian explosion 0 many animals began to diversify creating new species 0 hypotheses I predators evolved leading to more natural selection I evolution of Hox gene I rise in atmospheric oxygen 0 animals evolve with a larger body and faster metabolism Body plans 0 gradegroup sharing key biological features 0 not necessarily a clade O categorized by symmetry of bodies 0 radial symmetry I can be divided into smaller halves at any angle along a central axis 0 bilateral symmetry 0 two sided I dorsal top and ventral bottom I right and left sides I anterior head and posterior tail ends 0 radial symmetry 0 only top and bottom I jelly sh drifts and can equally feel and react from all sides 0 bilateral symmetry 0 top bottom head tail left right I useful for animals that need to catch prey or escape Maj or grades 0 symmetry is lateral or bilateral o 2 grades for embryonic germ layers 0 diploblastic I ectoderm and endoderm o triploblastic O ectoderm mesoderm and endoderm O coelom has 3 grades 0 pseudocoelomates I formed in blastocoel O coelomates I coelom taken from mesoderm O acoelomates I no coelom o Planes of cell division and differentiation 0 protostome development I determinate and spiral cleavage occur 0 deuterostome I radical and indeterminate cleavage Body cavity 0 acoelomates have no body cavity 0 pseudocoelomates have body cavity from blastocoel O coelomates have true coelom formed in mesoderm O a body cavity cushions organs and allows internal organs to grow without deforming outer wall
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