APY107 - Genetics

APY107 - Genetics - Howare variations passedon tooffspring?...

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Genetics    How are  variations passed on to offspring?
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Gregor  Mendel
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Between 1856 and  1863 Mendel used the  common garden pea in a  number of cross-breeding experiments
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Variations in common garden peas
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Derivation Of  Mendel’s First  Principle Principle Of  Segregation
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Mendel began by  isolating two pure  strains for the trait  of seed color; either  yellow or green. His next step was to  cross these pure  strains.   
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In the generation  produced by this cross,  the green trait  disappeared!
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Mendel’s next step was  to cross this generation  which possessed all  yellow seeds. In the generation  produced by this cross,  the green seed trait  reappeared at a  frequency of  1:3.
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1:2:1 GENOTYPIC RATIO AMONG OFFSPRING IN THE F2 GENERATION
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The Law of Segregation  1.  the observed  characteristics of organisms  are determined jointly by  two particles (alleles),  one inherited from the 
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APY107 - Genetics - Howare variations passedon tooffspring?...

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