Figure 2.

(a, b) General developmental characteristics of normal, dwarf and backcross-healthy embryos (differentiated pigment cells, beating heart pumping blood throughout the circulatory system, eyes pigmented, eye lens completely formed and a fully mobile tail, detached from the yolk sac). (c, d) General phenotype of backcross-moribund embryos (small head, small eyes, deformed eye lens, reduced cell pigmentation, deformities of the tail). Note that egg chorion was removed (a, d) and embryos were manually unfolded with dissecting needles in a and c. Units on scale are 0.1 mm.