Yes, and both mother and father must carry the gene to pass it along. IIRC, it is VERY rare, and is also what helped many humans avoid death by the black plague.
A chain always breaks ath the weakest link. Right?
Hypothetical:
Where would a chain break if all the links were of equal strength, shape, shape, size... equal in every way. Ignore all tolerance rules, this is hypothetical!
Thanks!