it seems to be an incomplete dominate gene... I'm not 100% sure but from my breeding's yes you can get straight combs out of 2 parents with kings comb... but so far every cross bred i have hatched had it as well...
My only laying pp I noticed has a straight comb from MPC. She lays nice dark eggs and otherwise looks good. Very tame. She's a pet so not headed to the block but do you think I should leave her out of the breeding program?