You recently isolated a mutant in the fruit fly, Drosophila
melanogaster, that results in the flies being unable to orientate themselves
in a straight line, ie they continuously fly in circles. You have called this
new mutation cir. You suspect that the cir mutation is located on
chromosome 2 close (within 5cM) of the withered wing gene whd.
Discuss fully the genetic crosses and subsequent analyses you would do
to investigate your hypothesis.