ANT211H5 Lecture Notes - Lecture 3: Preformationism, Pronucleus, Egg Cell
Document Summary
Sociobiologists cannot ignore analyses of the learning process. Evolution must be understood as a modification of developmental processes over generations: must defuse the nature vs nurture controversy. Sperm is enveloped into egg"s cytoplasm: ovum undergoes 2nd meiotic division, male & female pronuclei grow (12 hours, nuclei unite = zygote. Implantation in the uterine wall: trophoblast cells o blastocyte. A multiplicity of cell types all arise from a single cell zygote. : the emergence of structural organization whereby cell types and structures differ from one. The potential of cells to change their original function. Often wanes or disappears as differentiation progresses. Is a process of continual alteration of pre-existing structure within a particular environment. An organism"s structure changes over time as an interactive function of the pre-existing structure, and the environment which the structure is in. Each structural element in an organism is considered to have its separate precursors outdated.
