Table 1: Results of F1 Cross

Observed Phenotypes of F2 Progeny
# green plants = V # white plants = V Total # plants

Petri Dish 1 >

Petri Dish 2 >
Total

Observed Frequency of F2 Phenotype, Green:White = ______:______
Calculation of Observed Ratio (Frequency) = Total Number of (Color) Seedlings for Both Dishes ÷ Total of All Seedlings

To calculate the observed frequency of F2 phenotypes (green and white) in this F1 cross, you need to fill in the table with the number of green and white plants observed in each Petri dish.

Start by collecting data from Petri Dish 1 and Petri Dish 2 and filling in the table:

Table 1: Results of F1 Cross

Observed Phenotypes of F2 Progeny
# green plants = V # white plants = V Total # plants

Petri Dish 1 > ? ? ?

Petri Dish 2 > ? ? ?

Total ? ? ?

Once you have recorded the number of green plants and white plants in each dish, you need to calculate the total number of plants for each phenotype by adding the numbers in each column and record the totals in the "Total" row.

For example, if you observed 10 green plants and 5 white plants in Petri Dish 1, and 8 green plants and 7 white plants in Petri Dish 2, the table would look like this:

Table 1: Results of F1 Cross

Observed Phenotypes of F2 Progeny
# green plants = V # white plants = V Total # plants

Petri Dish 1 > 10 5 ?

Petri Dish 2 > 8 7 ?

Total ? ? ?

To find the total number of plants for each phenotype, add the numbers in the columns. In this example, the total number of green plants would be 10 + 8 = 18, and the total number of white plants would be 5 + 7 = 12.

Table 1: Results of F1 Cross

Observed Phenotypes of F2 Progeny
# green plants = V # white plants = V Total # plants

Petri Dish 1 > 10 5 ?

Petri Dish 2 > 8 7 ?

Total 18 12 ?

To calculate the observed frequency (ratio) of green to white phenotypes, divide the total number of green plants by the total number of white plants:

Observed Frequency of F2 Phenotype, Green:White = Total Number of Green Seedlings ÷ Total Number of White Seedlings

Using the example totals from earlier (18 green plants and 12 white plants), the observed frequency would be:

Observed Frequency of F2 Phenotype, Green:White = 18 ÷ 12 = 1.5:1

Therefore, the observed ratio (frequency) of green to white phenotypes in the F2 progeny is 1.5:1.

To calculate the observed frequency of F2 phenotype, Green:White, we need to fill in the table first.

Table 1: Results of F1 Cross

Observed Phenotypes of F2 Progeny
# green plants = V # white plants = V Total # plants

Petri Dish 1 >
Petri Dish 2 >
Total

Let's say in Petri Dish 1, you observed 10 green plants and 5 white plants. And in Petri Dish 2, you observed 8 green plants and 7 white plants.

Now let's fill in the table:

Table 1: Results of F1 Cross

Observed Phenotypes of F2 Progeny
# green plants = 10 # white plants = 5 Total # plants

Petri Dish 1 > 10 5
Petri Dish 2 >
Total

Next, we need to calculate the total number of green and white plants for both dishes.

Total number of green plants = 10 + 8 = 18
Total number of white plants = 5 + 7 = 12

Now we can calculate the observed frequency of F2 phenotype, Green:White.

Observed Frequency of F2 Phenotype, Green:White = 18:12

Simplifying the ratio, we divide both sides by 6 (the greatest common divisor):

Observed Frequency of F2 Phenotype, Green:White = 3:2

Therefore, the observed frequency of F2 phenotype, Green:White is 3:2.