in fruit flies pr- mutant is autosomal recessive and produces purple eyes while wild type flies exhibit red eyes
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Mutant eye colors seen in Drosophila, one of which is purple. There are several wild red-eyed flies that are pr+pr+, and flies with purple eyes are prpr. Another homozygous 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 vgvB. The wild type alleles (pr+ and vg+) are dominant, and both genes are autosomal. From experiments involving the testcrossing of prtpr Vgtvg 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
Katlin K.
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors: 10 wild-type 240 brown 240 bright red 10 orange The mother of these progeny resulted from a cross between flies from two true-breeding lines. What are the genotypes of these two lines?
Madhur L.
The production of eye-color pigment in Drosophila re quires the dominant allele $A$. The dominant allele $P$ of a second independent gene turns the pigment to purple, but its recessive allele leaves it red. A fly producing no pigment has white eyes. Two pure lines were crossed with the following results: Explain this mode of inheritance, and show the genotypes of the parents, the $F_{1},$ and the $F_{2}$
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