Question: Purple eyes (pr), black body (b), and vestigial wings (vg) are
encoded by three recessive genes i…


Purple eyes (pr), black body (b), and vestigial wings (vg) are
encoded by three recessive genes in flies that are linked on
chromosome 2. A fly with purple eyes, black body, and vestigial
wings is crossed with a fly that is homozygous wild-type (red eyes,
gray body, and normal wings) at all three genes. An F1 fly is then
crossed with a fly that has purple eyes, a black body, and
vestigial wings. The progeny of this testcross are: Red eyes, gray
body, normal wings 411 Red eyes, gray body, vestigial wings 61 Red
eyes, black body, normal wings 28 Red eyes, black body, vestigial
wings 1 Purple eyes, gray body, normal wings 2 Purple eyes, gray
body, vestigial wings 30 Purple eyes, black body, normal wings 60
Purple eyes, black body, vestigial wings 412

a. Determine the order of these genes on the chromosome.

b. Calculate the map distances between the genes and draw the
map.

c. Determine the coefficient of coincidence and the interference
among these genes.

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