11-2 Probability and Punnett Squares

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Probability and Punnett Squares
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11-2 Probability and Punnett Squares

Key Terms Genotype – The genetic makeup. What genes they have. TT Tt tt Homozygous – Having two identical alleles (TT or tt) aka truebreeding Heterozygous – Having two different alleles (Tt) aka hybrid Phenotype – Displayed physical characteristics. What trait they express. Examples: Tall, Blonde hair, Brown eyes, Freckles

Probability and Punnett Squares What is the probability that you flip two coins and the combination is tails/tails? Tails Tails ½ x ½ = ¼ Using a Punnett square H T H T HH HT HT TT

Tt X Tt Cross Problem: Cross a hybrid (heterozygous) tall with a hybrid (heterozygous) tall pea plant Alleles that have segregated. Found in gametes (pollen) Found in gametes (egg) Go to Section:

¼ TT (homozygous dominant) ¼ tt (homozygous recessive) Tt X Tt Cross Expected Genotype ¼ TT (homozygous dominant) ½ Tt (Heterozygous) ¼ tt (homozygous recessive) Expected Phenotype ¾ Tall ¼ Short Go to Section:

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