Part A: Punnett Squares
I. Monohybrid Crosses
1. In pea plants yellow peas (A) are dominant to green peas (a).Show a cross between two heterozygous yellow pea plants (Aa xAa).
What is the genotypic ratio of the offspring? _______ AA :_______ Aa: _________ aa
What is the phenotypic ratio of the offspring? _______ Yellow:________ Green
Part B: Using the Chi-square (χ2)analysis
9. In Parent 1 (P1) corn plants, the colorpurple is dominant to yellow, and round shape isdominant to wrinkled, which is why both Filial (F1) generation cornplants have the purple and round phenotypes, even when one of theparents (P1) is yellow and wrinkled.
The cross below (F1 x F1) produced the F2 generation corn thatyou are seeing in Figure 1. Determine thephenotypic ratios of the offspring of this cross: A crossbetween two F1 generation (heterozygous purple and heterozygousround) corn plants.
Phenotypic Ratio: _____: _____:_____:_____ (This is yourhypothesis: The corn in Figure 1 has thisratio.)
| PR | Pr | pR | pr |
PR | PPRR | PPRr | PpRR | PpRr |
Pr | PPRr | PPrr | PpRr | Pprr |
pR | PpRR | PpRr | ppRR | ppRr |
pr | PpRr | Pprr | ppRr | pprr |
