I am looking for a mechanism that would cause ovum containing a specific allosome to degenerate before they could form a zygote.
More detailed background: I am trying to design a unique method of what I learned is called diploid arrhenotoky. Males and females are both diploid, but males are only produced parthenogenically.
Arrhenotoky produces diploid females and haploid/parahaploid males, not true diploid males. Haploid individuals can't carry two alleles and that complicates Mendelian inheritance.
The Z/W or Z/0 system works differently: ZW/Z0 zygotes become female, ZZ zygotes male; male produces Z sperm while female produces Z and W/0 ovum or ZZ and WW/00 (non-viable) zygotes under facultative parthenogenesis.
The only way I can think of to keep male zygotes from being conceived sexually is to make them non-viable somehow... I have no idea how to keep Z ovum from becoming viable.