In a cross in Drosophila, a female heterozygous for the autosomallylinked genes a, b, c, d, and e (abcde/ + + + + +) was testcrossedwith a male homozygous for all recessive alleles (abcde/abcde).Even though the distance between each of the loci was at least3 map units, only four phenotypes were recovered, yielding thefollowing data: Phenotype No. of Flies+ + + + + 440a b c d e 460+ + + + e 48a b c d + 52 Total = 1000 Why are many expected crossover phenotypes missing? Can anyof these loci be mapped from the data given here? If so, determinemap distances.
In a cross in Drosophila, a female heterozygous for the autosomally
linked genes a, b, c, d, and e (abcde/ + + + + +) was testcrossed
with a male homozygous for all recessive alleles (abcde/abcde).
Even though the distance between each of the loci was at least
3 map units, only four
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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