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(a) What phenotypic proportions would be expected if the genes for red eyes and white-banded wings were located on different chromosomes?

(b) What is the genetic distance between the genes for red eyes and white-banded wings?

A geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation spastic (sps) and determines that spastic is due to an autosomal recessive gene. She wants to determine if the spastic gene is linked to the recessive gene for vestigial wings (vg). She crosses a fly homozygous for spastic and vestigial traits with a fly homozygous for the wild-type traits and then uses the resulting Fj females in a testcross. She obtains the following flies from this testcross.

vg+

sps+

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