Probability and punnett squares
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Probability and Punnett Squares. Probability. Probability a number that describes how likely it is something will happen Can be expressed as a ratio, fraction, or percentage When you flip a coin, you have what probability of getting heads? 1 out of 2 1 : 2 (ratio) ½ (fraction)

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Probability and Punnett Squares

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Probability and punnett squares

Probability and Punnett Squares


Probability

Probability

  • Probability a number that describes how likely it is something will happen

  • Can be expressed as a ratio, fraction, or percentage

    • When you flip a coin, you have what probability of getting heads?

      • 1 out of 2

      • 1 : 2 (ratio)

      • ½ (fraction)

      • 50% (percentage)


Punnett squares

Punnett Squares

  • Chart that shows all the possible outcomes of a genetic cross – allows you to determine the probability


Determining genotype and phenotype ratios from a punnett square

Determining genotype and phenotype ratios from a punnett square

  • Genotype Ratios

    • 1 GG : 2 Gg : 1 gg

    • 25% GG, 50% Gg, 25% gg

  • Phenotype Ratios

    • 3 Green : 1 white

    • 75% Green, 25% white


Practice

Practice!!!

  • In chickens, brown feathers are dominant to blue.

  • Cross a heterozygous brown chicken with a blue chicken. Give genotype and phenotype ratios

Genotypes : 50 % Bb , 50 % bb

Phenotypes: 50% Brown, 50 % blue


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