2. A purple-flowering plant (PP) is crossed to a white-flowering plant (pp). A. Using a Punnett...
2. A purple-flowering plant (PP) is crossed to a white-flowering plant (pp).
A. Using a Punnett square, diagram the cross. What are the genotypic and phenotypic outcomes?
B. Two F1 individuals from the previous cross are crossed to each other. Draw a new Punnett square, diagramming the new outcome. What is the ratio for purple flowers to white flowers? How many genotypes are there? In what frequency to they occur?
Homework Answers
2. A
PP x pp
| P | P | |
| p | Pp | Pp |
| p | Pp | Pp |
Phenotypic outcomes: All plants have purple flowers
Genotypic outcome: All plants are heterozygous.
2. B.
Pp x Pp
| P | p | |
| P | PP (purple flower) | Pp (purple flower) |
| p | Pp (purple flower) | pp (white flower) |
The ratio of purple flower : white flower = 3:1
There are three genotypes: PP, Pp and pp
Frequency of PP = 1/4
Frequency of Pp = 2/4 = 1/2
Frequency of pp = 1/4
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