How much genetic distance must there be before two creatures cannot produce fertile offspring?

Question

How much genetic distance must there be before two creatures cannot produce fertile offspring?

Answer 1

if it comes under a common genome classification

Answer 2

this probably depends on a few factors

probably a lot if you are talking about hybrids yet for some animals speciation can occur even with just a handfull of genes so i'd say there is a wide range

you have to consider what it is that makes them not able to produce fertile offspring, is it chromosomes, is it a size difference, preferance, location, lock and key (parts not fitting together), pheromones,  lots of different factors

Answer 3

I've been looking for that answer on Google for several minutes and can't come up with anything that would serve as the answer you are looking for.

On Google, I did a search on "genetic distance +infertile offspring."  You could give it a try.  Much of the information I didn't understand.  Maybe you will.