"Your mother was negative (dd). Your father was negative (dd). Two negatives can only produce a negative child. They have no dominant 'D' gene to give."
Mr. Graves tapped his gavel. "The estate passes to Elena Blackwood."
Arthur Blackwood, the patriarch of the Blackwood shipping empire, had died three days ago. Tonight, his family gathered for the reading of the will. But before the lawyer, Mr. Graves, could crack the seal on the document, Detective Silas Vance stepped forward from the shadows of the fireplace. blood type pedigree mystery
Blood Type Pedigree Mystery Analysis | PDF | Genotype - Scribd
For decades, blood typing was considered the "gold standard" of informal paternity testing. We were taught the simple elegance of Mendelian genetics in high school: two Type O parents can only have a Type O child; a Type AB parent can never have a Type O child. It seemed like an open-and-shut case of biological accounting. "Your mother was negative (dd)
"Elena," Vance said gently. "You are Type A Negative. Arthur (AB-) could give an A gene. Your mother (A-) could give an A or O. And regarding the Rh factor... two negative parents produce a negative child. You fit both the ABO and the Rh genetic profiles perfectly."
Vance flipped the chart over to reveal a simplified genetics table for the Rhesus factor. They have no dominant 'D' gene to give
"Your mother loved all three of you," Mrs. Higgins, the old housekeeper, spoke up from the corner. She looked sad, but resolute. "But she made mistakes. She was a Negative woman, married to a Negative man. She could not produce Positive children. Julian, your father was the stable hand. Marcus... your father was the lawyer who drafted the previous will."