# How does this compare to the ratio obtained from counting the corn kernels? (

Once the Punnett square for Question 13 is complete, calculate the ratio of purple and yellow kernels (recall that if the dominant trait is present, it will be expressed).

What is the ratio of purple to yellow kernels based on the Punnett square? (2 points)

How did this compare to the ratio obtained from counting the corn kernels for ear number two in part II of the lab? (2 points)

Recall from the background information that purple kernels are dominant and yellow kernels are recessive. Also recall that smooth kernels are dominant and wrinkled kernels are recessive. The third corn ear was the result of crossing a male ear of corn with the following gametes: PpSs, with a female ear of corn with the same gametes: PpSs. This is represented by the Punnett square, below. Complete the Punnett square by writing the correct letters that correspond to each number indicated in the table (for example, PPSS or ppss). (8 points)

PS Ps pS ps

PS 1 2 3 4

Ps 5 6 7 8

pS 9 10 11 12

ps 13 14 15 16

Once the Punnett square for Question 15 is complete, calculate the ratio of corn kernel varieties (recall that if the dominant trait is present, it will be expressed).

What is the ratio of kernels based on the Punnett square? (2 points)

How does this compare to the ratio obtained from counting the corn kernels? (2 points)

What are the genotypic and phenotypic ratios for kernel color and kernel texture for a dihybrid cross between PpSS x Ppss? (4 points)

genotypic ratio

phenotypic ratio

Using the results from the Punnett Square in Question 15, answer the following question: In a population of 240 corn kernels, how many will have smooth kernel texture? (2 points)

In a flower garden, a horticulturist is growing purple and white pansies. The horticulturist notices that a new pansy has sprouted. When it finally flowers, the pansy is lavender. Explain how this happened. (4 points)

With a botanist’s help, an individual decides to cross the lavender pansy with the white pansy. Will this result in any purple pansies? Explain. (4 points)

State an industrial concern/importance for knowing the genetic makeup of an organism. Explain why it is important in your example. (5 points)

APPLICATION QUESTION

(Application) How might the information gained from this lab pertaining to genetics be useful to you, or how can you apply this knowledge to your everyday life as a non-scientist? The application will be graded according to the rubric below. (20 points)