Chromosome 3 of corn carries three loci (b for plant-color booster, v for virescent, and lg for liguleless). A testcross of triple recessives with F1 plants heterozygous for the three genes yields progeny having the following genotypes: 305 +v lg. 275 b++, 128 b+lg. 112+v+, 74++lg. 66 bv +, 22+++, and 18 bv lg. The coefficient of coincidence is: 0.89 0.69 0.59 O 0.79