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Lecture 14

ANTH 1210 Lecture 14: Lecture 14

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University of Manitoba
ANTH 1210
Haskel J.Greenfield

oS82 Experiment crossed two colours (green and yellow) Results not blended colour, inherited either yellow (75) or green (25) Developed concept of dominant and recessive traits Dominant: expressed physically Recessive: hidden (expressed only if both parents contribute it) Law of Segregation of Inheritable characteristics: inheritance, particulate in nature (inherit a discrete trait), not blending or mixing Gene: did not formulate gene as a basic unit of inheritance (close to it) Modern Genetics: Reformulation of biology: rediscover Laws of Heredity (3 botanists independently) 1990: published results of their experiments, which supported Mendels work Modern genetics term first coined: 1906 George Simpson (1930s): formulates new synthetic theory (combines evolution and genetics) Structure of Cell: Membrane nucleus and cytoplasm Nucleus: chromosomes stored (DNA and RNA) Chromosomes (1953): Watson and Crick discovered way to photograph into a cell and see structure of DNA Humans: 46 strands, 23 pairs of chromosomes in every cell rd 23 pair = sex (X or Y) DNA (deoxyribonucleic acid) is double helix Strands composed of sugar and phosphates Base pairs: adenine and thymine, cytosine and guanine DNA (genetic) code: sequence of molecules on chromosome strands that are matched up together (base pairs, sugars and phosphates) DNA and nuclear acid found in nucleus Gene is the portion of DNA that identifies a traitcharacteristic Allele: specific information for trait (from both parents, found at two different loci) Locus (loci): information found at a particular location on strand Gene: pair of locations (two loci) Allele: single loci
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