Page 354 - Enders_Game_Full_Book

As always, Ender's mind automatically found seeming contradictions. "How does a hereditary disease get passed on if it makes its victims sterile?"
"It's usually passed through collateral lines. One child will die of it; his brothers and sisters won't manifest the disease at all, but they'll pass on the tendency to their children. Naturally, though, we were afraid that Marc o, having children, would pass on the defective gene to all of them."
"You tested them?"
"Not a one had any of the genetic deformations. You can bet that Dona Ivanova was looking over my shoulder the whole time. We zeroed in immediately on the problem genes and cleared each of the children, bim bim bim, just like that. "
"None of them had it? Not even a recessive tendency?"
"Graqas a Deus," said the doctor. "Who would ever have married them if they had had the poisoned genes? As it was, I can't understand how Marc o's own genetic defect went undiscovered."
"Are genetic scans routine here?"
"Oh, no, not at all. But we had a great plague some thirty years ago. Dona Ivanova's own parents, the Venerado Gusto and the Venerada Cida, they conducted a detailed genetic scan of every man, woman, and child in the colony. It's how they found the cure. And their computer comparisons would definitely have turned up this particular defect-- that's how I found out what it was when Marc o died. I'd never heard of the disease, but the computer had it on file."
"And Os Venerados didn't find it?"
"Apparently not, or they would surely have told Marcos. And even if they hadn't told him, Ivanova herself should have found it."
"Maybe she did," said Ender.
Navio laughed aloud. "Impossible. No woman in her right mind would deliberately bear the children of a man with a genetic defect like that. Marc o was surely in constant agony for many years. You don't wish that on your own children. No, Ivanova may be eccentric, but she's not insane."
Jane was quite amused. When Ender got home, she made her image appear above his terminal just so she could laugh uproariously.
"He can't help it," said Ender. "In a devout Catholic colony like this, dealing with the Biologista, one of the most respected people here, of course he doesn't think to question his basic premises."
"Don't apologize for him," said Jane. "I don't expect wetware to work as logically as software. But you can't ask me not to be amused."