Chapter 12 (2)

Chapter 12 (2) - Ch. 12 10/21/09 Early ideas about heredity...

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Ch. 12 10/21/09 Early ideas about heredity People knew that sperm and eggs transmitted information about traits Blending theory Problem: o Would expect variation to disappear o Variation in traits persists Genetics Field founded by Gregor Mendel Knew little of cells, chromosomes, etc. Work was rediscovered around 1900 Mendel’s hypothesis for heredity Each trait is determined by a pair of genes Law of segregation: pairs of genes are separated during gamete formation Law of independent assortment: random chance determines which gene goes to which gamete There may be more than one form of a gene (allele) o Dominant will always mask recessive Homozygous = same alleles Heterozygous = different alleles Locus = position of gene on chromosome o Locus for gene 1 (homozygous) o Locus for gene 2 (homozygous) o Locus for gene 3 (heterozygous) Genetic Symbolism Often use initial letter of dominant allele
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This note was uploaded on 03/20/2012 for the course BIOL 1001 taught by Professor Minor during the Fall '08 term at LSU.

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Chapter 12 (2) - Ch. 12 10/21/09 Early ideas about heredity...

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