BIOL303 Lecture Notes - Lecture 1: Germ Layer, Morphogenesis, Fate Mapping
6 Dec 2018
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Key concepts & study questions for biol 303. The process of progressive and continuous change that generates a complex multicellular organism from a single cell. Development occurs throughout embryogenesis, maturation to the adult form, and continues into senescence. Epigenesis: suggested by aristotle and harvey, structures were made from scratch. Adult form of lower animals are not embryos of higher animals. Form sheets connected by junctional complex (under go cell death if individuals cell separated) Have a clear polar character from one side to another. Loosely organized and loosely attached cells (more like bold individuals) Fat maps can be constructed by direct observation and confirmed by cell removal (e. g. Homologous structure: structures derived from a common ancestral structure, our arms and the bat"s wings are homologous, don"t perform similar functions. Disruptions: the underlying cause of the abnormality is not genetic but an exogenous agent (chemical, irradiation, viruses, drugs, hyperthermia). E. g. thalidomide babies were born with phocomelia (short limbs)
