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Dihybrid Punnett Squares

This guide simplifies the process of using dihybrid Punnett squares to determine genotypic and phenotypic ratios. Follow these essential steps: 1. Identify the parents' genotypes (e.g., heterozygous tall TtRR and homozygous red). 2. Apply the FOIL method to determine possible gametes (e.g., TR or tR). 3. Calculate the Punnett square size based on gamete combinations. An example illustrates crossing TtRR with TtRr, leading to a variety of outcomes. Learn to determine ratios for traits such as tall/red, tall/white, short/red, and short/white.

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Dihybrid Punnett Squares

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  1. Dihybrid Punnett Squares

  2. Steps • 1. Identify the parents genotypes. Ex. heterozygous tall, homozygous red flowers. TtRR 2. Use FOIL to get gamete (sex cell) possiblities. Ex. TR or tR 3. Short cut…how many boxes for the punnett square depends on how many possible gametes….

  3. Example • TtRR x TtRr • P1: TR, tR • P2: TR, Tr, tR, tr TR Tr tR tr TR tR

  4. Phenotypic ratios • How many??? Tall and Red: Tall and White: Short and Red: Short and White:

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