FireHunter,
Xenomorph,
11 years ago
Going back and noticing the argument about there being a Queen on the ship and whatnot, the mist probably kept the eggs dormant, and when Kane fell in, he broke the barrier, releasing them from their dormancy. The Jockey would have been impregnated because of a malfunction in the mist, I'd think.
As for the Queen, no, there would have been no Queen on the ship, Queens weren't even a concept in the first Alien movie, and the Queen in Aliens was born from someone in Hadley's Hope.