In a cross in Drosophila, a female heterozygous for the autosomally linked genes a, b, c, d, and e (abode/ + + + + + ) was testcrossed with a male homozygous for all recessive alleles. Even though the distance between each of the loci was at least 3 map units, only four phenotypes were recovered, yielding the following data:
Phenotype | No. of Flies |
+ + + + + | 440 |
a b c d e | 460 |
+ + + + e | 48 |
a b c d + | 52 |
Total = 1000 | |
Why are many expected crossover phenotypes missing? Can any of these loci be mapped from the data given here? If so, determine map distances.
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