APchapter14notes - Chapter14Notes Mendelandthegeneidea...

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    Chapter 14 Notes Mendel and the gene idea
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    Concept 14.1 In 1857, Gregor Mendel began breeding  peas to study inheritance Geneticists use the term  character  to  describe a heritable feature - ex. flower color Each variant for a character is called a  trait - ex purple flowers or white flowers
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    Concept 14.1 Mendel began his experiment using  true- breeding  plants - when the plants self-pollinate, all  offspring are of the same variety Mendel would cross 2 true-breeding plants.   This crossing is called  hybridization .
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    Concept 14.1 - the true-breeding parents are the  generation  (parental generation) and  their hybrid offspring are referred to as  the  F 1  generation  (First filial). - when the F 1  generation is allowed to  self-pollinate, their offspring become the  F 2  generation  (second filial).
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    Concept 14.1 By the law of segregation, the two alleles  for a character are packaged into  separate gametes. - P generation: purple x white - F 1  generation:  all purple - F 2  generation: ¾ purple, ¼ white Mendel saw this in 6 other varieties
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    Concept 14.1
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    Gregor Mendel’s Discoveries 1. Alternative versions of genes (different  alleles) account for variations in 
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APchapter14notes - Chapter14Notes Mendelandthegeneidea...

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