Question

The map below shows the relative positions of four autosomal markers on a normal Drosophila autosome. d c a b 25.7mu 2.2mu 17.2mu Wild-type males were X-irradiated and then mated to a/a, b/b, c/c, d/d females to generate F1 heterozygotes. The phenotype of most of the F1 heterozygotes was wild-type. One of F1 female progeny, whose phenotype was wild-type, was mated to a homozygous recessive male from the true breeding stock. The resulting progeny exhibited the following phenotypic classes, in the numbers indicated: Phenotype # of flies a b c d 91 + + + + 89 a b c + 9 + + + d 11 Total 200 a) What class of X-ray-induced mutation produced the results given in the table above? b) Describe this X-ray induced mutation quantitatively, in terms of map units.

          The map below shows the relative positions of four autosomal markers on a normal Drosophila autosome.
d c a b
25.7mu 2.2mu 17.2mu
Wild-type males were X-irradiated and then mated to a/a, b/b, c/c, d/d females to generate F1 heterozygotes. The phenotype of most of the F1 heterozygotes was wild-type.
One of F1 female progeny, whose phenotype was wild-type, was mated to a homozygous recessive male from the true breeding stock. The resulting progeny exhibited the following phenotypic classes, in the numbers indicated:
Phenotype # of flies
a b c d 91
+ + + + 89
a b c + 9
+ + + d 11
Total 200
a) What class of X-ray-induced mutation produced the results given in the table above?
b) Describe this X-ray induced mutation quantitatively, in terms of map units.

The map below shows the relative positions of four autosomal markers on a normal Drosophila autosome.
d c a b
25.7mu 2.2mu 17.2mu
Wild-type males were X-irradiated and then mated to a/a, b/b, c/c, d/d females to generate F1 heterozygotes. The phenotype of most of the F1 heterozygotes was wild-type.
One of F1 female progeny, whose phenotype was wild-type, was mated to a homozygous recessive male from the true breeding stock. The resulting progeny exhibited the following phenotypic classes, in the numbers indicated:
Phenotype # of flies
a b c d 91
+ + + + 89
a b c + 9
+ + + d 11
Total 200
a) What class of X-ray-induced mutation produced the results given in the table above?
b) Describe this X-ray induced mutation quantitatively, in terms of map units.

Added by Scott W.

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