there are some genetic markers that do contribute to sport success... David Epstein's book, sport gene, discusses it in good detail.
but, the nature of the sport plays a huge role in how that genetic advantage impacts player selection... contact team sports have so many interconnected variables at play, that they are probably the least subject to that (outside of the height gene in basketball... # of 6'10+ NBAers vs the general population is a huge outlyer, for obvious reasons).
one of the more interesting ones has to do with visual acuity and baseball... there's some gene tied to heightened visual acuity that is present in miniscule % in the general pop, but at exponentially large numbers in baseball... the correlation seems to be that it helps with batting at an early age (can see cues of the ball when it is pitched sooner/better than without it, that leads to better swing adjustments, leads to better batting success, leads to being selected to better teams (and more external motivation from parents/teammates/coaches) all of which contributes to earlier and better environment for "choosing" to put in the work to get better at baseball... all that to say that possessing the gene doesn't make you a better baseball player, it just sets in motion a bunch of interrelated factors that increases the selection odds at play to drive the work required to get to the big leagues.
i don't recall him referencing anything about hockey... aside from the social markers like being from a wealthier community, a hockey family and/or a community where hockey is the be all end all sport, i don't know that there are any genetic markers that positively correlate to ending up in professional hockey (there would be negative correlations like extreme height or shortness or other factors that would work against being able to play) aside from general athleticism and perhaps earlier physical maturation, both of which would be strongly tied to the social markers (Canadians excel at hockey not because we're wired for it, but because from a young age, the best athletes get the most social reward from excelling there as opposed to in other disciplines... plus the idols, plus the community emphasis, plus the abundance of access to rinks et.).
all of this is why the draft seems like such a crapshoot... and some scouts/scouting departments do better at hitting on later gems... dissecting the noise and immediacy of performance results that are more driven by external factors than internal ones... an inexact science but certainly not without some applicable frameworks to improve success.