n corn, a colored aleurone is due to the presence of an R allele; r/r is colorless. Another gene controls the color of the plant, with g/g being yellow and G_being green. A plant of unknown genotype is test-crossed, and the following progeny plants were obtained. Colored green 89 Colored yellow 13 Colorless green 9 Colorless yellow 92 What is the recombination frequency between the R locus and the G locus? A. 45.6% B. 9.85% C. 91.15% D. 4.93% E. 6.4%
In corn, a colored aleurone is due to the presence of an R allele; r/r is colorless. Another gene controls the color of the plant, with g/g being yellow and G_being green. A plant of unknown genotype is test-crossed, and the following progeny plants were obtained.
Colored green 89
Colored yellow 13
Colorless green 9
Colorless yellow 92
What is the recombination frequency between the R locus and the G locus?
| A. |
45.6% |
|
| B. |
9.85% |
|
| C. |
91.15% |
|
| D. |
4.93% |
|
| E. |
6.4% |
Barbara McClintock’s report that bits of DNA could jump around and integrate themselves into new loci in DNA was so dramatic and arcane that many thought the phenomenon was either a one-off or not real! Only with the subsequent discovery of transposons in bacteria (and in other eukaryotes) were McClintock’s jumping genes finally recognized for what they were! As we describe her experiments, keep in mind that McClintock’s research and intuitions about gene regulation and epigenetic.
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