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Recessive mutant alleles of an x-linked gene in Drosophila, crossveinless (cv), prevent the development of supporting structures in the wings. Recessive mutant alleles of another x-linked gene, vermilion (v) cause a bright red eye phenotype (the wildtype eye colour is brick red). The location of an x-linked recessive lethal gene (l) was tested in relation to the cv and v loci. A female heterzygote for the lethal was mated to a male carrying cv and v. F1 heterozygous females ( l/cv v) were testcrossed to males from the cv v strain and the following percentages of phenotypes were observed in the progeny:
Phenotype: FEMALES Males
Wildtype 38.8 0.3
Crossveinless, Vermilion 38.8 77.3
Crossveinless 11.2 7.7
Vermilion 11.2 14.7
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