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Randa, Bio100

  • 3.

    let hybrid’s offspring self-fetilize for several generations (F2, F3, etc. generations)

    • --

      counted number of offspring of each type of trait for the succeeding generations

  • D.

    Mendel’s results

    • 1.

      F1 generation of purple x white cross = all purple flowers purple = dominant trait white = recessive trait

2. F2 generation some offspring had recessive (white) trait proportions of purple to white = 3/4 to 1/4 (3:1)

3. subsequent generations (self-fertilize)

purple: 2/3 mixture, 1/3 always purple white: always white

Mendelian ratio 3/4 dominant to 1/4 recessive in F2 generation of pure cross

F2 generation really 1:2:1 genotypic ratio

  • --

    Mendel described phenotypes

    • E.

      Interpretation of results--genotype frequencies

1. WW x ww

2 alleles of the gene

    • 2.

      heterozygous vs. homozygous

    • 3.

      Punnet square to show genotype outcome in a homozygous dominant x homzygous recessive cross, all offspring heterozygous

  • III.

    Mendel’s Laws

  • A.

    First Law: Law of Segregation

    • --

      refers to Mendel’s observed ratios

    • --

      alternative forms of a trait are distinct (no blending)

    • --

      in heterozygous individuals, gametes have equal probability of possessing either allele

2

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