Chapter 32 - Introduction to the Animals Notes

Chapter 32 - Introduction to the Animals Notes - INTRO TO...

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INTRO TO ANIMALS (METAZOA) Multicellular/specialized cells Eukaryotic heterotrophs No cell wall/chloroplasts Dominant diploid (2n) organism ; only haploid as gametes  Store glucose as  GLYCOGEN Most  MOBILE  at some point in life cycle;          LARVA  (free living sexually immature form) may be only time in some DEVELOPMENT ZYGOTE undergoes CLEAVAGE (MITOSIS) to make BLASTULA (hollow ball of cells) GASTRULATION:   1) Cells in blastula  move inward over lip of  BLASTOPORE       Form digestive system (tube within a tube)  2) Germ layers form       Some animals only  TWO GERM  layers form  (DIPLOBLASTIC)           EX: Sponges and cnidarians      Most animals - THREE GERM  layers form  (TRIPLOBLASTIC) GERM LAYERS ENDODERM- forms lining of digestive tract, digestive (LIVER, PANCREAS) & respiratory organs (LUNGS) MESODERM- forms  muscle, skeletal, circulatory, excretory, reproductive systems ECTODERM- forms outer covering ( epidermis) , brain, central nervous system WHEN DO CELLS DECIDE? DETERMINATE Cells decide EARLY what they will become Removing a cell or splitting ball of cells produces embryo with missing parts INDETERMINATE -cells decide LATER what they will become
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This note was uploaded on 02/14/2012 for the course BIO 151 taught by Professor Grinblat during the Fall '08 term at University of Wisconsin.

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Chapter 32 - Introduction to the Animals Notes - INTRO TO...

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