Single-Factor Punnett Square Notes. Punnett Square A diagram that can be used to predict the gene combinations that might result from a cross.

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Single-Factor Punnett Square Notes

Punnett Square A diagram that can be used to predict the gene combinations that might result from a cross

Basic Problems: T = Tall t = short Tt x TT

T t T T Tt

T tT t T T Tt TT: Tt : tt Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 2 : 2 : 0 4 : 0

Basic Problems: T = Tall t = short Tt x Tt

T t T t TT Tt tt

T tT t T t TT Tt tt TT: Tt : tt Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 1 : 2 : 1 3 : 1

Word Problems A = Axial flowers a = terminal flowers Cross homozygous axial plant with a terminal plant. __________ X _________ AAaa

Basic Problems: A = axial a = terminal AA x aa

A A a a Aa

A AA A a a Aa AA: Aa : aa Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 0 : 4 : 0 4 : 0

Word Problems A = Axial flowers a = terminal flowers Cross 2 plants that are heterozygous for axial flowers. __________ X _________ Aa Aa

Basic Problems: A = axial a = terminal Aa x Aa

A a A a AA Aa aa

A aA a A a AA Aa aa AA: Aa : aa Genotypic Ratio:_____________ Phenotypic Ratio:_____________ 1 : 2 : 1 3 : 1

Backwards Problems G = Green pods g = yellow pods ¾ of the plants produced by a cross between 2 unknown pea plants have green pods and ¼ have yellow pods. What are the genotypes of the parent plants? __________ X _________

G G G gg

G g G g G G G gg G g g

Parents Genotypes are…. Gg X Gg

Backwards Problems G = Green pods g = yellow pods What cross would result in ½ of the offspring having green pods and ½ of the offspring having yellow pods? __________ X _________

G G gg

G g g g G G g g

Parents Genotypes are…. Gg X gg