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.”
“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.” lab activity blood type pedigree mystery
Here’s a short draft for a lab activity story titled Title: The Heirloom Type She pointed to Elena, Marco, and Luis on the chart
The estate granted Julian a share—not because of the blood type pedigree alone, but because the mystery of the pedigree led them to ask the right questions. And in forensics, asking the right question is half the solution. Would you like a printable student worksheet to accompany this story, including data tables and analysis questions? His biological father was someone else—blood type unknown