Hi,
Ralphs breeding records and his discussions about it in the past - also the fact he made a butter daddy.
If it had been a recessive passed on by the platty daddy he would have had to breed the platty daddy to a butter first to get a butter het daddy - he would have mentioned this.
But if it was an allele (or another mutation that is part of the white snake complex ) that was dom or co-dom all he would have had to do would be to breed a butter to a lesser sib or platty daddy - which is what he did.
Also did you not wonder why, with all the lesser to lesser breedings going on to make BEL's, no one had ever produced a platty daddy?
Every single lesser out there comes originally from a platty daddy animal. If it really was recessive and caried by them all then the first generations at the very least should have been shooting out 25% platty daddys from lesser to lesser pairings. Granted it would have dropped quickly wih any outcrossings but it should still happen - it simply doesn't.
I wish it did - I like platty daddys and have a little lesser male (F2 from an african platty mamma found at the same time as Ralphs platty daddy apparently) and it would tickle me no end if he was all I needed to make a platty daddy.
dr del