Question

There are several mutant eye colours seen in Drosophila, one of which is purple. Homozygous wild red-eyed flies are pr+pr+ and flies with purple eyes are prpr. Another mutation affects the length of the wings: vestigial (vg) gives the wings a 'scrunched up' look. Homozygous normal-winged flies (wild type) are vg+vg+ and vestigial-winged flies are vgvg. The wild type alleles (pr+ and vg+) are dominant and both genes are autosomal. From an experiments involving the testcrossing of pr+pr vg+vg females to prpr vgvg males the following progeny were scored: Offspring Phenotype | Gametes from the female | Observed Wild type (red eyes, normal wings) | pr+ vg+ | 157 Red eyes, vestigial wing | pr+ vg | 965 Purple eyes, normal wing | pr vg+ | 1,067 Purple eyes, vestigial wing | pr vg | 146 Total | | 2,335

          There are several mutant eye colours seen in Drosophila, one of which is purple.
Homozygous wild red-eyed flies are pr+pr+ and flies with purple eyes are prpr. Another
mutation affects the length of the wings: vestigial (vg) gives the wings a 'scrunched up' look.
Homozygous normal-winged flies (wild type) are vg+vg+ and vestigial-winged flies are vgvg.
The wild type alleles (pr+ and vg+) are dominant and both genes are autosomal.
From an experiments involving the testcrossing of pr+pr vg+vg females to prpr vgvg males
the following progeny were scored:

Offspring Phenotype | Gametes from the female | Observed
Wild type (red eyes, normal wings) | pr+ vg+ | 157
Red eyes, vestigial wing | pr+ vg | 965
Purple eyes, normal wing | pr vg+ | 1,067
Purple eyes, vestigial wing | pr vg | 146
Total | | 2,335

There are several mutant eye colours seen in Drosophila, one of which is purple.
Homozygous wild red-eyed flies are pr+pr+ and flies with purple eyes are prpr. Another
mutation affects the length of the wings: vestigial (vg) gives the wings a 'scrunched up' look.
Homozygous normal-winged flies (wild type) are vg+vg+ and vestigial-winged flies are vgvg.
The wild type alleles (pr+ and vg+) are dominant and both genes are autosomal.
From an experiments involving the testcrossing of pr+pr vg+vg females to prpr vgvg males
the following progeny were scored:

Offspring Phenotype | Gametes from the female | Observed
Wild type (red eyes, normal wings) | pr+ vg+ | 157
Red eyes, vestigial wing | pr+ vg | 965
Purple eyes, normal wing | pr vg+ | 1,067
Purple eyes, vestigial wing | pr vg | 146
Total | | 2,335

Added by Laura R.

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