I don't think that its a genetic predisposition.
If it was a sour crop, some are more prone to yeast infection which can be brought on by using antibiotics very much like in humans. And, of course, if a bird has a weakened immune system for any reason (including antibiotic use) they aren't as able to fight off what they may be able to handle under better circumstances. Sometimes molds/yeasts in feed items can contribute as well.
Anyhow...all of that is to say that I wouldn't worry about genetic predisposition as much as looking at possible things that they can be getting that might cause an impact. If sour crop is suspected, or if you have given any antibiotics lately, probiotics can be used for the rest of the flock to hopefully restore gut flora.
For probiotics I recommend Avi-Culture II - the only avian probiotic on the market that is cultured on non-gmo substrate. ( Website is bad but the product is good... a little goes a long way and has a good shelf life if kept in fridge http://www.avi-culture-2.com/shop.html )
They can have some plain yogurt. (I know that folks are concerned about lactose in milk products but that is not an issue with yogurt as the LABs digest the lactose.)
Another thing that works GREAT for treating sour crop is to let them eat organic coconut oil in it's solid state. They LOVE the stuff and it is anti-fungal. I've known several folks that used the coconut oil and nothing else with sour crop and each bird recovered nicely. They withheld grain-based feed for a few days, gave coconut oil, and some animal-based protein. ACV should NEVER be used when you have sour crop and should be withheld until the bird is well if you're inclined to use ACV at all.
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[COLOR=8B4513]Last week, I had to make a quick trip to Indy. My last voice treatment didn't work, so they fit me in their schedule with only 24 hours notice. The treatment worked better this time, but my reason for even bringing this up is that while I was away, two of Bonbon's Black Bantam Cochin chicks disappeared (eggs from[/COLOR] @ellymayRans [COLOR=8B4513]). It rained off and on all day last Wednesday--the day I left. That night, my DH locked the bantam cage where Bonbon and her chicks stay. He didn't count them because it was raining, and he assumed he'd hear chicks crying or Bonbon clucking if there was something wrong. He said that the next morning when he opened their coop, there were only three chicks. He looked everywhere around our property, but didn't even find any signs of them. The missing ones were the youngest two, and they often lagged behind. All five of her chicks were born on different days, so they've been different sizes. We can only assume it was a hawk since we've seen one around regularly for the past month. It's strange to have two missing, though, unless it swooped in twice. We've been lucky not to have lost any chickens from predators-- before this. It's just strange and so sad.[/COLOR] 
[COLOR=8B4513]Poor babies. Of course, my DH was horrified that it happened on his watch, but I told him that I know from reading this thread that all kinds of things happen. Sometimes I've had difficulty counting the chicks since they're black, Bonbon is brown, it's dark, and they're underneath her.[/COLOR] [COLOR=8B4513]Here are the remaining three chicks. They are 6 weeks old, but several days apart-- can anyone figure out what sex each one is? Besides this crummy photo, I have a crummy video, which may help: [/COLOR]
If it helps, I think you have three girls left. Here's Mr. Po at about the same age--he was pretty obviously a boy:[/COLOR]
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Trudi still hasn't figured this out, so she hasn't been able to swim since she came home with us. :/
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