contest genetics

[wmhein@aol.com (wmhein@aol.com)]

I recently purchased a collection of CQ magazines dating back to 1949. 
Whilst thumbing through the July, 1967 issue (Don Miller on the cover), I ran
across a photo of WA4HOM, Brenda Garlough, winner of the 1967 YL-OM Contest
in both the phone and CW divisions.  The write-up states that "Besides
hamming, Brenda enjoys their 3-year old son, Trey...."

Is there a contesting gene?  If so, is it dominant or recessive?

Bill AA6TT