The color of a soybean plant's leaves is influenced by the amount of chlorophyll It produces. Chlorophyll is a natural green pigment in plant leaves. Scientists tested the frequency of leaf-color genotypes in a soybean population over time. The table below shows the three tested genotypes and the leaf color each genotype produced. The scientsts grew soybean plants and observed the leaf color of the seedlings produced at Day 7 and Day 21. The number of seedlings for each genotype is shown in the table below.

Question

Total

216

173

56

20

(C ^ 1 * C ^ 2)

111

106

Green-yellow (C°C)

Green (C ^ 6 * C ^ 6)

Time (days)

7

49

47

Use the diagram to answer the question.

Calculate the observed frequencies for each genotype and compare them to the expected frequencies. Which conclusion best supports your calculations?

(1 point)

The change in the frequency of only two genotypes suggests that evolution is not occurring

The significant increase in the observed frequency of the gamma ^ c * c ^ c genotype compared to the expected frequency suggests that evolution is occurring

The significant increase in the observed frequency of the z ^ r * c ^ r genotype compared to the expected frequency suggests that evolution is occurring.

The significant decrease in the observed frequency of the C ^ C * C ^ C genotype compared to the expected frequency suggests that evolution is stalling.

21

Data from the Experiment

Number of Seedlings

Answer 1

To calculate the observed frequencies for each genotype, we can divide the number of seedlings for each genotype by the total number of seedlings.

Observed frequencies:
- (C^1 * C^2): 111/216 ≈ 0.514
- Green-yellow (C^c): 47/173 ≈ 0.272
- Green (C^6 * C^6): 49/56 ≈ 0.875

Comparing the observed frequencies to the expected frequencies, we can see that the frequency of the (C^1 * C^2) genotype is close to the expected frequency, while there is a significant increase in the observed frequency of the Green (C^6 * C^6) genotype compared to the expected frequency.

Therefore, the conclusion that best supports these calculations is: The significant increase in the observed frequency of the Green (C^6 * C^6) genotype compared to the expected frequency suggests that evolution is occurring.