I'm not an expert on deer genetics, but like franky says, genetics are genetics. If an organism creates an offspring through sexual reproduction, exactly 50% of the offsprings genes come from each parent. And if this is "Just a slight abnormality in this individual deer that created joined pedicles", then that specific organism MUST have genes that coded for it's antlers to grow in this fashion. Therefore, every single sperm cell created by this animal has at least a 50% chance of having the same genetic profile. Whether or not the same traits are exhibited by the offspring involves a HUGE amount of other factors (it took me a semester long genetics course to learn that stuff, so i won't bore you guys with details here).
So yeah, Does and Bucks alike should both contribute to antler growth in male offspring. This is the basis for so much differentiation in ALL life. All it takes is for a very small amount of the genetic code to differ from the "norm" to cause really radical changes in the phenotype (what an organism actually looks like)... I mean, when we analyze the entire genome of humans and chimpanzees, we find that 97% of all the genes are exactly the same. It's that 3% of difference that results in so many obviously different characteristics