(9-13-06) Theories of Inheritance

(9-13-06) Theories of Inheritance - 9/13/06 Anthropology...

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Unformatted text preview: 9/13/06 Anthropology notes RNA (Ribonucleic acid) More primitive than DNA Found outside of the cell nucleus Single strand of chemical bases o Cytosine o Guanine o Adenine o Uracil (instead of Thymine) Mitosis Prophase 46 chromosomes duplicate Metaphase chromosomes line up in center of cell Anaphase Spindle fibers pull chromosomes to polar region of cell Telophase cell divides into 2 identical diploid cells Meiosis (occurs in sex cells) First Phase: Prophase o Crossing over exchange of genetic material Metaphase Anaphase Telophase o Not identical o Material varied Second Phase No real prophase o Chromosomes don't replicate Metaphase Anaphase Telophase cell divides into2 non-identical haploid cells Theories of Inheritance Preformation (Theory dating back to time of Aristotle) 490 BCE Unfolding of a preformed individual Spermist males held preformed person Ovist females held preformed person Gregor Mendel Born in Czechoslovakia 1822 Monk at a monastery in Brunn Studied botany, physics, and Math Worked as a teacher and tended the monastery gardens Hybrids o Mendel knew of no laws that governed hybrid production o He formulated an experiment that would become the model for many others to follow ...
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