Thank you, very succinct and what I wanted to hear! So 1/4 of the genome pool is replaced with the higher species entire 'mutated' set and the distribution is mendelian from there. Perfect.
I think my biggest realization from this conversation is the above, as well as finally grasping that the genes are represented as being on different chromosomes and segregate independantly, i.e. no two genes are ever linked unless bound by species (biome, humidity etc). One other thing- the recently acquired mutational set must segregate immediately, as I never see the default genome as complete, just scattered alleles amongst the progeny, makes sense now.