Two-Gene Cross
The photos on this page represent six examples of Cob 6, each of which contains the offspring of the same type of two-gene cross. There are four different phenotypes among the Cob 6 kernels: purple and smooth (genotype D_N_), purple and wrinkled (genotype D_nn), yellow and smooth (genotype ddN_),and yellow and wrinkled (genotype ddnn).
Answer the questions in your assignment document about a hypothesis and prediction regarding Cob 6.
As you did for Cob 1, use ImageJ to count five rows of kernels on each Cob 6 and record your observations in your notes. For kernels that appear to be a combination of purple and yellow, use your judgement as to whether the kernel is more purple or more yellow and count it accordingly. It may feel like you are counting a lot of kernels, but this is still quite a small sample size for your statistical analysis. Use your data to complete the chi-squared table and answer the remaining questions in your assignment document.
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number of kernels |
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phenotype |
Cob 6_1 |
Cob 6_2 |
Cob 6_3 |
Cob 6_4 |
Cob 6_5 |
Cob 6_6 |
TOTAL |
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purple, smooth |
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purple, wrinkled |
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yellow, smooth |
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yellow, wrinkled |
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TOTAL |
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This is the end of the lab - we hope you had fun with the corn babies!