A geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation "quiver" (qu) and determines that it is due to an autosomal recessive gene. She wants to determine if the gene encoding quiver is linked to the recessive gene for vestigial wings (vg). She crosses a fly homozygous for quiver and vestigial traits with a fly homozygous for the wild-type traits and then uses the resulting F1 females in a testcross. She obtains the following flies from this testcross: vg+ sps+ 230 vg sps 224 vg sps+ 97 vg+ sps 99 total 650
Added by Ivan M.
Step 1
First, we need to calculate the recombination frequency (RF) to determine if the genes are linked. The RF is calculated as the number of recombinant offspring divided by the total number of offspring. Recombinant offspring are those with a different combination Show more…
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Katlin K.
A geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation quiver (qu) and determines that it is due to an autosomal recessive gene. She wants to determine whether the gene encoding the quiver phenotype is linked to the recessive gene encoding vestigial (reduced) wings $(v g) .$ She crosses a fly homozygous for quiver and vestigial traits with a fly homozygous for the wild-type traits and then uses the resulting $\mathrm{F}_{1}$ females in a testcross. She obtains the following flies from this Are the genes that cause vestigial wings and the quiver phenotype linked? Do a chi-square test of independence to determine whether the genes have assorted independently.
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