...dominant over red (p). With the genes? for pollen grain shape, long pollen grains (L) are dominant over round (l). Plants heterozygous for purple flowersand long pollen grains (PpLl) are test-crossed with the homozygous recessive (ppll). The following offspring are produced:
purple, long 118
red, round 122
purple, round 32
red, long 28

Are the genes for flower color and pollen grain shape on the same chromosome? Can you figure out how far apart they are on the chromosome?