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Using Punnett Squares

Using Punnett Squares. Step 1: Choose a letter to represent the genes in the cross. Given : R = round r = wrinkled. Step 2 : Write the genotypes of the parents. P : Rr x Rr. Step 3 : Determine the possible genes that each parent can produce. Rr Rr. R. r. R. r.

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Using Punnett Squares

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  1. Using PunnettSquares

  2. Step 1: Choose a letter to represent the genes in the cross Given : R = round r = wrinkled

  3. Step 2 : Write the genotypes of the parents P : Rr x Rr

  4. Step 3 : Determine the possible genes that each parent can produce RrRr R r R r or or

  5. Step 4: Write the possible genes at the top and sides of the Punnett square R r R r

  6. Step 5 : Complete the Punnett square by writing the gene combinations in the boxes R r R R R r R R r r r r

  7. Step 6 : Determine the phenotypes and genotypes of offspring RR = round - 1 homozygous dominant } Rr = round 2 heterozygous Rr = round rr = wrinkled - 1 homozygous recessive

  8. ratios: Phenotypes- 3 round to 1 wrinkled Genotypes- 1 RR: 2 Rr: 1 rr

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