In carrying out crosses with the nematode Caenorhabditis
elegans, a geneticist hypothesizes that the allele for dumpy body
shape (dpy) is recessive to the allele for normal body (dpy+), and
the allele for uncoordinated (unc) is recessive to the coordinated
body movement allele (unc+). Moreover, she hypothesizes that these
two genes are unlinked (i.e., they assort independently). In a
mating between a normal bodied, coordinated worm and a dumpy,
uncoordinated worm, all of the F1 worms were normal bodied and...