Here is a Burmese python case:

http://www.nature.com/hdy/journal/v9.../6800210a.html

I regularly hear of isolated pet ball pythons laying eggs but it's usually someone without the skills/equipment to hatch the eggs and I don't know that any testing has been done if there ever where hatchlings. It’s just too easy to explain as retained sperm. Basically I think if it exists in ball pythons it isn't being found because we aren't looking for it. It would be very messy for the market. I know a breeder who thinks he might have seen it this year and he is considering selling off what was once a favored female ball python and all her offspring because he is worried it might happen again and doesn't want the uncertainty or to be associated with the unpredictable genetics.

I certainly wouldn’t expect that it would be possible for the male to contribute the full set of genetic info but then again I wouldn’t think it would be possible that homozygous spiders never exist at any stage of reproduction. I’ve been hearing scattered reports of heterozygous co-dominant males to normal for the same mutation females producing apparent super/homozygous co-dominant offspring. I think the current industry explanation is a null allele situation on the females side. It would be interesting if we can get to the point where genetic testing is so cheap and available that some of these animals could be tested and compared to their parents to see for sure what is going on.