Question

I wrote down everything that is on my homework I am having trouble with, i don't know what else to put, this was on my homework.

Part II of Lab: In this part of the lab, frequencies of two corn kernel characteristics will be determined: kernel color and kernel texture. In observing the ears of corn, note that the kernels are either purple or yellow and that they are either smooth or wrinkled. With respect to color, purple is the dominant color, and yellow is the recessive color. With respect to texture, smooth is the dominant texture, and wrinkled is the recessive texture. Use the following designations for each trait: purple (P); yellow (p); smooth (S); wrinkled (s). Keep this information available as it will be needed later on in the lab.

1. Observe the image of a corn ear below. Notice that the ear of corn contains purple and yellow kernels. Study the image and then count three rows of kernels, tallying the number of purple and the number of yellow kernels. Record this information on a piece of paper to refer to later in this laboratory. Review the results and indicate the frequency (ratio) of purple to yellow kernels.

I counted 43 yellow and 53 purple kernel corn since the picture is not downloading.

Click on image to enlarge.

2. Observe the image of a corn ear below. Notice that the ear of corn contains purple and yellow kernels. Study the image and then count three rows of kernels, tallying the number of purple and the number of yellow kernels. Record this information on a piece of paper. Review the results and indicate the frequency (ratio) of purple to yellow kernels.

There are 17 yellow and 63 purple kernels of corn.

Click on image to enlarge.

3. Observe the image of a corn ear below. Notice that the ear of corn contains purple and yellow kernels. Additionally, notice that some of the corn kernels are smooth, and some of the corn kernels are wrinkled. Study the image and then count three rows of kernels, tallying the number of kernels. For this exercise, there will be four different kernels to count: purple and smooth, purple and wrinkled, yellow and smooth, or yellow and wrinkled. Record this information on a piece of paper. Review the results and indicate the frequency (ratio) of corn kernels.

I counted 2 yellow wrinkled, 5 yellow smooth, 18 purple smooth, 5 purple wrinkle of kernel corn.

Click on image to enlarge.

1. Refer to the data on the corn kernel color ratio from Part II of the lab above.
2. What was the tallied frequency (phenotypic ratio) of purple to yellow kernels from Step 1? Which of the possible Mendelian ratios is best represented by this corn cob? (2 points)
3. What was the tallied frequency (phenotypic ratio) of purple to yellow kernels from Step 2? Which of the possible Mendelian ratios is best represented by this corn cob? (2 points)

3. What was the tallied frequency (phenotypic ratio) of purple and smooth, purple and wrinkled, yellow and smooth, or yellow and wrinkled kernels from Step 3? Which of the possible Mendelian ratios is best represented by this corn cob? (Remember there were four possible types for this part of the lab.) (2 points)

4. Explain why the tallies from each corn cob do not exactly match the Mendelian ratio. (2 points)

Answer 1

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