Vance closed the file. "Elena Blackwood, you are the sole heir."
: The paper "An unusual case of blood group ABO inheritance: O from AB X O" details a Japanese family where an O-type child was born to AB and O parents. Unlike Cis-AB, this was caused by a rare structural mutation during the formation of the egg (oogenesis). blood type pedigree mystery
Marcus looked at the lawyer, then at the door. "He... he adopted me! He knew!" Vance closed the file
Typically, blood types A and B are inherited separately from each parent. In this "paradoxical" inheritance, parents with types AB and O can unexpectedly have children who are either AB or O , which normally seems genetically impossible. Marcus looked at the lawyer, then at the door
"Forgive the intrusion," Vance said, his voice gravely and low. "But before anyone inherits a penny, there is the matter of the 'Continuity Clause'."
"Your mother," Vance said, glancing at the portrait of the late Mrs. Blackwood hanging above the mantle, "was Type A. It is possible she had an affair with a man who carried the O gene. But Arthur? He was ruled out the moment you were born."
Behind them sat the housekeeper, Mrs. Higgins.