Exercise 1: A Monohybrid Cross

Data Table 1. Monohybrid Punnett Square (F2 generation)

F2 Generation

Parent 1

__

__

Parent 2

__

__

Data Table 2. Expected and Observed Phenotypic Values for the Monohybrid Cross

Green

Albino

Total

Expected

Observed

Data Table 3: Photograph of Germinated Seeds

Photograph:

Data Table 4: Chi-square Values for the Monohybrid Cross

Values:

Answers:

Chi-square value

Degrees of freedom

P-value

Questions:

A) If all of the yellow (albino) seedlings were removed from the population, would the next generation still have a chance of displaying the albino phenotype? Explain your answer.

B) How did the expected ratio of green to albino seedlings compare to the observed ratio of green to albino seedlings? Use your results to help explain your answer.

C) What is the probability (as a percent) of growing a green seedling over an albino seedling? What was the chance (as a percent) that the results of the experiment were based on random sampling? Explain your answers.

D) What are some possible sources of error that could have affected the germination of the seeds and thus, the growth of the green and albino seedlings? Explain your answers.

Exercise 2: A Dihybrid Cross

Data Table 5. Dihybrid Punnett Square (F2 generation)

F2 Generation

Parent 1

__

__

__

__

Parent 2

__

__

__

__

Data Table 6. Expected and Observed Values Dihybrid

Purple & Smooth

Purple & Wrinkled

Yellow & Smooth

Yellow & Wrinkled

Total Counted

Expected

Observed

Corn Side A:

Corn Side B:

Corn Side C:

Corn Side D:

Total

(A + B + C + D)

Data Table 7. Chi-square Values for a Dihybrid Cross

Values:

Answers:

Chi-square value

Degrees of freedom

P-value

Questions:

A) What is the percent error for each of the four phenotypes between the expected kernel numbers (calculated from the Punnett square) and the observed kernel numbers?

B) What was the