Good grief, you trully A R E still alive and hopefully WELL

(clapping)
Genetics -- 101 and upward -- OH MY !!
All kidding aside, the real old time ANGUS from Aberdeen absolutely were all polled, and sired polled cattle every time. Then, the phenom of "Let's inject 1/32 Chi and/or Holstein" in there took affect, behind the sceanes of course, back in the 70's I would guess. WHY?? Competition with the new and improved pheno types being placed first by the kill plants -- big was better!!!
To get the added frame they now wanted or needed to compete with the newly arrived Chi's and Simmi's, those good little black Angus had to be discreatly crossd, one generation at a time untul they still looked and acted Angus, but were significantly larger. Notall were crossed, but alot were and we all know it.
Bulls such as Pine Drive and Cobble Pond New Yorker were two that had let's say questionable backgrounds WAY back. These bulls as an example would at times sire scurs, that was fact, plus some added white!
The horned Gene is or at least WAS completely dominant for many hundreds of years. The vast majority of breeds started out as horned cattle -- most true breed still are today. So, even though a pure bred modern Angus is crossed with the horn gene carrying crossbred cow, some could comeout horned.
I know this year in my own herd, I used GF Mile High Max on several cows -- ALL were polled and from polled cows that were from polled cows. BOTH of the hfrs -- one from a Oscar 711xChill FactorxForeplay (All Polled) was horned, as was her 7/7 sister from the original Foreplay. Solid horns. Max is a horned bull carrying a very strong horned gene - my guess is from the Sugar Ray background. These two calves were the first two born from these two cows ever having horns. Go figure!
I think it is even more probamatic to explain when a polled bull is used one crossbred cows, even polled ones, that some times they come horned. I think the F-1 cross will almost always be the easiest for them to get the horns off of, it is the later crosses (2nd, 3rd, 4th breed cross) that it seems to simply come back to life and is less preditable!
Now that I have totally confused you even further -- my job is done for the day -- hehehehe!
Hope all is well in Iowa big J --- tell the nieghbors I am still here -- snowed today already -- turning 54 the 26th, jeez, how could that be -- I was 25 yesterday!!!! :

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Happy Thanksgiving to A L L --
Terry and gang (clapping)
(TJ posted his response while I was typing mine, sorry if it counterdicts any where -- to lazy to edit!! hehe)