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More common in East Asia, cis-AB is a rare blood type with an allele carrying both A and B antigens, complicating blood transfusion and paternity inference. A cis-AB mom mistaken as AB and an O dad may have an "impossible" "AB" kid.

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ncbi.nlm.nih.gov/pmc/articles/P…

Once probably a microbial invader, mitochondria now power us up, track our matrilineal ancestral lineage and (Grid #SPOILER) help identify our infants' time-traveling adult kids, assuming you have no other childbearing, living female relatives.

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Uniparental inheritance of mitochondrial DNA, possibly facilitated through degradation of paternal copies and/or outnumbering by maternal copies, is speculated to serve to prevent adverse competition between the mitochondria.

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annualreviews.org/doi/pdf/10.114…