Figure 1
Schematic representation of the breeding design of the wingless strain. The genotypes and their segregation ratios are those expected if the wingless gene is a major recessive allele. Individuals used to produce the next generation are in the square. The original wingless male shown in the P generation mated with a winged female, and each male offspring in the F1 generation copulated with one sibling female, as well as with 10 wild-type winged females. Wingless offspring from the full-sib mating were mated with a winged individual dammed by the normal winged females. Winged × winged crosses were made in the F3 generation. Winged females in the F4 were mated with wingless in the previous generations to estimate their genotypes. See further explanation in the text.
