For those visual learners.....here's what going on in Komodos, the two cells circled are fusing-->one cell is a secondary polar body, the other is the mature egg. Perhaps the two polar bodies containing W chromosome fuse but WW is not a viable genotype, like YY in mammals.
Notice how in this mechanism all autosomes would be homozygous for every gene as well.
Image was edited from here.
Just goes to show you that herpetologists need to know their genetics and cell biology too!
PS>Does anyone know how to draw a shape in Photoshop but make the fill color transparent? Great program but not always easy to use!
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