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Mendel Presentation - Note Guide Rules of Inheritance • Mendel began his experiments with plants that are true-breeding or pure-bred. What does this mean? • RULE: It takes ____________ genes to determine a trait • one allele (a version of a gene) from each __________________. • For the following traits (as determined by genes), what are the alleles that Mendel considered? • Stem length: __________________ and ___________________ • Seed shape: __________________ and ___________________ • Seed color: ___________________ and ___________________ • Pod color: ____________________ and ___________________ • RULE: Genes don’t blend • they can be ____________________ or ______________________ (remember, there are always exceptions!) • One of Mendel’s experiments • P (parent generation): True breeding dominant • F1 (first generation): x True breeding recessive Phenotype = _____________________________ • F2 (second generation): Phenotype = 3 ____________ : 1 _____________ • RULE: Gene pairs (when you combine one allele from each parent) can be: • ____________zygous HH or hh • ____________zygous Hh • Example: • P: YY x yy • F1: Yy Yy Yy Yy • F2: YY Yy Yy yy • In F2 generation, what is the ratio of: • genotypes _________________ • phenotypes_________________
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