Lab Activity Blood Type Pedigree Mystery !new! -

Carlos was type A (AO)—so he could have been Julian’s father biologically, but the timing was wrong. The real shock came when Marco secretly submitted a DNA test: he and Julian shared a Y-chromosome marker that Carlos didn’t have. Julian’s father was not a stranger—he was Carlos’s own brother, long presumed dead, who had a brief relationship with Ana before she married.

Maya tapped the tray. “So we need to test Julian’s actual blood against Ana’s archived sample and the father’s hypotheticals. But the family won’t release the father’s info.” lab activity blood type pedigree mystery

Her partner Leo leaned in. On the chart: Grandparents Ana and Carlos (both type A), their three children—Elena (type O), Marco (type AB), and Luis (type A)—and Luis’s two kids, Sofia (type A) and Diego (type B). Carlos was type A (AO)—so he could have

“Found in the estate papers,” she said. “Turns out Ana wasn’t AB at all. She was O negative her whole life. The AB was a transcription error made decades ago.” Maya tapped the tray

“But that’s not the only clue,” Dr. Reeves added. “Carlos’s blood type was confirmed type A—but Ana’s medical record from decades ago shows she was typed as type AB.”

Silence. Then Priya, the group’s quietest member, spoke up. “That changes everything. Two type A parents can have a type O child. But an A and an AB cannot produce a type O child. Ever.”

“But here’s the twist,” Dr. Reeves said. “Carlos is not the father.”