Somewhat OTT, but there is a very good work of fiction that deals with rapid evolution and speciation and does talk about epigenes iirc. Anyhow its a good read and very believable - Darwin's Radio, by Greg Bear.
People often approach animal colourbreeding like it's a science - punnet squares and ratios and suchlike. But it's the modifiers that make it an art rather than a sciencemoustress said:And then at the far end of the subject We have seven or ten major things, the ABC's mousie genetics which also sounds so simple. There's a world of details in between. Sometimes you have to look into the details to get past the simpler stuff...like what exactly makes a mousie who is definitely champagne, genetically by the simple system, look like a dove. And then, of course there are all the other things that can alter the appearance of critters, diet, environment, etc. but al that stuff is based on genetics as well. Then there's RNA, which another great big ball 'o wax. And mtDNA. Oh, lordy, there's so much I don't know!