Punnett Square Tutorial

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Presentation transcript:

Punnett Square Tutorial Mrs. T. Frazier Life Science Liza Jackson Preparatory School

Suppose you had two plants Suppose you had two plants. One plant was tall while the other was short. If these plants were mated what would be the phenotype and genotype of the offspring? How many plants would be tall? How many plants would be short?

P1 T T P2 t T t Tt t Tt Tt

P1 T T P2 T t Tt t t Tt Tt Genotypic Ratio: 4:0

P1 T T P2 T t Tt t Tall Tall Tt Tt t Tall Tall Phenotypic Ratio: 4:0

What happens if the offspring plants were crossed with one another What happens if the offspring plants were crossed with one another? Will the outcome be different? On your table, place the P1 and P2 in the correct spot?

P1 T t P2 T t

P1 T t P2 T T T Tt t Tt tt

T t T T T Tt t Tt tt Genotypic Ratio: 1 : 2 : 1

T t T T Tt T Tt tt t 3 : 1 Tall Tall Tall P1 P2 Short Phenotypic Ratio:

?