If you look at the post I made today in dog breeds about breed origins – the retriever breeds were crossed for many years, and early litters had golden and flatcoat types in. There was meant to be one dog – forget his kennel name – that the breeds were descended from. I will see if I can remember where the Lab colour genetics thing is – cos the colour inheritance is similar I think – and you could have a play with that. 😉 Just have to remember the site. 😀
And genes is how it’s spelt since you asked. 🙂