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).
“Easy,” said Leo. “If Ana and Carlos are both type A, they can’t have a type O child unless they’re both heterozygous AO.”
Leo frowned. “But what if the old record is wrong? Blood typing isn’t perfect. Or what if Ana’s type changed? No—that doesn’t happen. Or what if—” He stopped. “Wait. What if Julian knows that? What if he’s counting on us not checking Ana’s historical type?” lab activity blood type pedigree mystery
“That’s your lab task,” Dr. Reeves smiled. “Using only the pedigree and a fresh blood sample from Julian, determine if he could be Ana’s son—and whether the estate should accept or reject his claim.”
Maya examined Julian’s alleged blood type on the intake form: . Her partner Leo leaned in
“But here’s the twist,” Dr. Reeves said. “Carlos is not the father.”
“If Julian is truly Ana’s son,” Maya said slowly, “and Ana was AB at the time of his birth, Julian cannot be type O.” “If Ana and Carlos are both type A,
She pointed to Elena, Marco, and Luis on the chart. “Their known father was Carlos. But Julian was born before Ana married Carlos. His biological father was someone else—blood type unknown.”