Autotrophs use photosynthesis
The result of this would greatly depend on the genotype of the parents. If either the father is homozygous Type A and the mother is homozygous Type B, then yes, a mix up has occurred because the probability of having an offspring with the blood type O would be zero. But if both of them are heterozygous, then having a child with type O will be possible with a 25% probability.
