Corn has a recessive trait for albinism. If both parent plants are heterozygous, meaning Cc by Cc ( think punnet squares from back in middle school science class), there is a 25% chance for albinism. If only one parent plant is heterozygous and the other is homozygous, CC by Cc, none of the seedlings would be albino. Thats why its rare, but not impossible. Its not a mutation or freak thing, just basic genetics. Totally recessive plants ( white ones) wont survive ( cc).
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