Punnett Square

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Punnett Square
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Genetics

• Dominant
• Recessive
• Homozygous dominant two letters TT
• Homozygous recessive two case letters tt
• Heterozygous Tt

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Genetics

• When present dominant traits always show up
• Tt
• tt
• TT

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Mendel Probability

• Mendel -1st to understand dominant and recessive
  genetic traits.
• Punnett Square a chart that shows all possible
  combinations of a genetic cross

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Punnett Square
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Punnett Square

• Genotype
• An organisms genetic makeup, or combination
• The Genes
• Phenotype
• An organisms physical or visible trait.

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How to do a Punnett Square

• BABY STEPS 1. determine the of the parent
  organisms 2. write down your "cross" (mating)
  ex Tt, TT

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• Step 3 Draw a punnett square. 

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4. "split" the letters of the genotype for each
parent put them "outside" the p-square
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• 5. determine the possible genotypes of the
  offspring by filling in the p-square 6.
  summarize results (genotypes phenotypes of
  offspring)

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