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Punnett Squares

Punnett Squares. Tt. Homozygous = purebred. Heterozygous = hybrid. TT or tt. Homozygous vs heterozygous. We use a Punnett square to :. Find the probability of the offspring Predict. Punnett Square Steps. 1 - identify traits that are dominant & recessive T = tall t = short

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Punnett Squares

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  1. Punnett Squares

  2. Tt • Homozygous = purebred • Heterozygous = hybrid • TT or tt Homozygous vs heterozygous

  3. We use a Punnett square to : • Find the probability of the offspring • Predict

  4. Punnett Square Steps • 1 - identify traits that are dominant & recessive T = tall t = short • 2 - Make the equation Tt x tt

  5. Tt x tt • t • T • t • t Steps continued • 3 - set up Punnett square and complete it

  6. 4 - list the possible genotypes • 5 - list the possible phenotypes • 50% tall • 50% short • 50% heterozygous tall • 50% homozygous short Steps continued

  7. Try it! • In pea plants for the trait for height the allele tall is dominant over short. • Cross a heterozygous tall plant with a homozygous short. Follow all 5 steps! SHOW ALL WORK!!

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