Dihybrid test crosses are made between each pairwise combination of the three genes C, D, and E with the following results:
CD: 222 CE: 48 DE: 198
Cd: 280 Ce: 455 De: 289
cD: 280 cE: 445 dE: 311
cd: 218 ce: 52 de: 202
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1000 1000 1000 total
1. Which are the recombinant classes in these three crosses?
2. Give the genotypes of the dihybrids in these three crosses, showing linkage arrangements.
3. Draw the map for these three genes, indicating the order and the lengths of the intervals in map units.
4. What can you say about crossover interference based on this data set?
5. Why do the map distances not add up?