$
4n
V_y
FIG. 2. Schemes of cytogenetic processes and sex determination in Bombyx
mori. D, meiotic spontaneous parthenogenesis of diploid oocytes; E, diploid ameiotic artificial parthenogenesis (2-7) and the origin of mixoploidy (6a-8a) ; F ,
tetraploid ameiotic artificial parthenogenesis.
212
B. L. ASTAUROV