Vance flipped the chart over to reveal a simplified genetics table for the Rhesus factor.
: 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).
The room erupted. Julian turned a shade of pale white, his mouth opening and closing like a fish. "That... that’s impossible! My mother was faithful!"
The paper explains that this is caused by a specific gene mutation or "unequal crossing over" that creates a single enzyme with dual A and B activities. Other "Mystery" Papers to Explore blood type pedigree mystery
Blood Type Pedigree Mystery Analysis | PDF | Genotype - Scribd
While the first instinct in these situations is often to suspect infidelity or a hospital mix-up, the truth is frequently found in the fascinating, rare world of genetic anomalies. The Rules of the Game (And Why They Break)
Marcus let out a breath he seemed to have been holding for a lifetime. "Then I'm safe. AB father can pass a B gene. B mother, B father... I'm legitimate. I’m the heir!" Vance flipped the chart over to reveal a
🩸 Solve the Blood Type Pedigree Mystery: Who’s the Real Father?
Vance stepped closer to Marcus. "You are Positive. You have the D antigen. Neither Arthur nor his wife possessed the genetic code to give you that antigen. You, Marcus, are the son of a different man entirely. A Positive man."
A baby has Type O blood . The mother has Type A blood . One potential father has Type AB , the other has Type B . Can you solve the pedigree puzzle before the DNA results come back? The room erupted
The scandal would destroy the family name, but the science was undeniable.
"Arthur was AB ," Vance explained to the room. "The Rh factor is determined by the presence of the D antigen. Positive is dominant (DD or Dd). Negative is recessive (dd). To be Negative, Arthur had to have two recessive genes. He was dd ."
The ABO blood group system is determined by the ABO gene on chromosome 9. You inherit one allele from each parent: are codominant. O alleles are recessive.