Biology, 08.10.2020 09:01 destinydiamond6887
In Drosophila melanogaster, vestigial wings (vg) is recessive to normal wings (vg+), black body (b) is recessive to gray body (b+), and purple eyes (pr) are recessive to red eyes (pr+). All three genes are located on the same chromosome. A female fly with vestigial wings, black homes body, and purple eyes is crossed to a male with normal wings, gray body, and red eyes. The F1 females produced by this cross were mated with vestigial, black, purple males in a test cross. After doing a test cross the following pheonotypes were obtained.
1779 vestigial wings, an ebony body and purple eyes
1665 normal wings, a brown body and red eyes
252 normal wings, an ebony body and purple eyes 241 vestigial wings, a brown body and red eyes
131 normal wings, an ebony body and red eyes
118 vestigial wings, a brown body and purple eyes
13 vestigial wings, an ebony body and red eyes
9 normal wings, a brown body and purple eyes.
1. Determine the order of these genes on the chromosome.
2. Calculate the map distances between the genes. Construct a genetic map for these three loci.
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