Bit late now, but sometimes it's not even genetic to pass down. Sometimes it's just an injuryI'm not an expert, but as long as it's eating and such, the chick should thrive. Don't euthanize it yet because there is a chance it will life a healthy life. I wouldn't suggest using the chick for breeding purposes though. People still don't know whether scissor-beak is congenital or hereditary, so better be safe than sorry when it comes to the next generation.