Colour genetics
What "split" means, why the father decides his daughters' colour, and what the mutation names actually stand for.
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Why the father decides his daughters' colour
Birds are ZW, not XY. The hen decides each chick's sex and the cock decides every daughter's sex-linked colour — which is why a cinnamon hen paired with a normal cock produces no cinnamon chicks at all.
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What "split" means in conure genetics
Split means a green-cheeked conure carries a colour gene it does not show. You cannot see it, only two things prove it, and hens cannot be split to cinnamon or yellow-sided at all.
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What is a pineapple conure, genetically?
There is no pineapple gene. A pineapple green-cheek carries cinnamon and yellow-sided at once, both on the same chromosome — which is why breeding them surprises people and why most calculators get one case wrong.