Synthetic lethality of spindle checkpoint genes. For graphs A, B, and C, the embryos, of the designated genotypes, were assayed for the ability to hatch (white filled bars) and the ability to develop to adulthood after three days on food (black filled bars). The san-1(ok1580);hcp-2(ok1757) animals were given four days to develop to adulthood. The data obtained is from four independent experiments with > 200 total animals assayed. Error bar is standard deviation.