BSCI Ch 14-15 notes

BSCI Ch 14-15 notes - CH 14 Mendel and the Gene Idea...

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CH 14 Mendel and the Gene Idea Character – a heritable feature (color) that varies among individuals Trait – each variant for a character (purple, green, orange) The Law of Segregation 1. Alternative versions of genes account for variations in inherited characters. 2. Alleles are alternative versions of a single gene. 3. For each character, an organism inherits two alleles, one from each parent. 4. The two alleles for a heritable character separate (segregate) during gamete formation and end up in different gametes. Testcross – a cross with a homologous recessive and dominant phenotype (unknown genotype). (ex. rr x RR or rr x Rr) Law of Independent Assortment – the alleles for two different traits sort into gametes independently . Complete dominance – one allele dominates. Codominance – both alleles affect the phenotype in separate distinguishable ways. (Human blood typing) Incomplete Dominance – a “mixing” of a character, e.g., the red x white = pink snapdragons. Reciprocal cross
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This note was uploaded on 04/07/2008 for the course BSCI 110B taught by Professor Due during the Spring '08 term at Vanderbilt.

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BSCI Ch 14-15 notes - CH 14 Mendel and the Gene Idea...

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