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That guy you
call your dad may not be - DNA testing has revolutionized medical science, but it
also has uncovered the myth of female monogamy. Now doctors are wondering how to break the news to men.
Following article re-posted from the Canadian Children's Rights Council and The Globe and Mail.
They came to the hospital together, a husband, a wife and the little daughter they feared had been cursed by
inheritance. Since birth, she had struggled to breathe, and all the signs pointed to cystic fibrosis.
If the girl truly had the incurable disease that clogs the lungs, she had to have received two copies of a
CF gene, one from each parent. Tests at the Hospital for Sick Children in Toronto confirmed the family's
worst fears -- and then some.
The girl was indeed afflicted. Her mom carried one of the culprit genes. But her dad, the doctors
discovered, was quite a different story. His DNA showed no sign of a CF gene, which means he is not a
carrier and he is not her dad.
Hospital staff have felt bound to keep the secret from him. But when they told the mom, it came as no
surprise; it rarely does.
"It is probably true in a lot of families, that daddy is not who you think it is," says Steve Scherer, a
senior scientist in department of genetics at the Hospital for Sick Children.
It's now widely accepted among those who work in genetics that roughly 10 per cent of us are
not fathered by the man we believe to be dad.
Geneticists have stumbled upon this phenomenon in the course of conducting large population studies and
hunting for genes that cause diseases such as cystic fibrosis. They find full siblings to be half-siblings,
fathers who are genetic strangers to more than one of their children and uncles who are much closer to their
nieces and nephews than anyone might guess. Lumped under the heading of "pedigree errors," these so-called
mis-paternities, false paternities and non-paternities are all science jargon for the unwitting number of us
who are chips off someone else's block.
The proverbial postman seems to be ringing twice in everyone's neighbourhood. Non-paternity is believed to
cut across all socio-economic classes and many cultures. Factor it into genealogical attempts to trace
ancestry and it can snap entire branches from a family tree. Considered in light of long-held views about
sexual behaviour, it exposes the myth of female monogamy and utterly shakes the assumption that women are
biologically driven to single-mate bliss.
The widespread use of DNA analysis has presented science and society with all sorts of new ethical problems,
and now it's pulling this naked truth out of the closet and into the courtroom. Men who call themselves
"Duped Dads" are looking for legal redress to protect themselves against paternity fraud, raising questions
about the definition of fatherhood. Several U.S. states are considering legislation that could exempt
non-biological fathers from having to pay child support.
Even the most learned among us are grappling with the implications. Last month, the 10-per-cent
non-paternity rate was cited during a science seminar for judges in Halifax.
"The judges were just shocked; they really couldn't get over how many people this would affect," Dr. Scherer
said. "They kept saying things about all those poor people who might be misled -- never realizing that one
of them might actually be among them!"
The notion of a woman carrying the child of someone other than her partner is older than the Christmas story
itself. No geneticist believes non-paternity to be purely the product of modern immorality; they have been
tripping over the infidelities of earlier generations for decades.
Cheryl Shuman, director of genetic counseling at the Hospital for Sick Children, said that 15 years ago,
when genetic tests were less powerful, researchers had to draw blood from a child, his or her parents and
both sets of grandparents. "Sometimes we'd get a call from the grandmother, and she'd say, 'Listen, my son,
or my daughter, doesn't know that their father is not their real father. . . .' "
In the interests of maintaining family peace, Ms. Shuman said, the tests would be dismissed as
Over the years, the hospital has relied on the advice of lawyers and ethicists to develop policies for
handling the situation. For example, its consent form now warns what a genetic test can reveal. Parents
"will sometimes giggle in the waiting room when they read the paragraph about non-paternity," Ms. Shuman
said. "But then we get the phone call later, forewarning us as to what we might find."
When a test disqualifies a father, "most women do express some surprise, but then there is a resignation, or
an acceptance that they were kind of half anticipating this was going to happen. But then all this is
followed very quickly by panic and questions as to whether or not we will betray their confidentiality."
If the case involves an expectant mother, Ms. Shuman explained, the hospital's legal obligation is clear:
The developing baby is considered part of the mother and the results of the tests therefore belong to her.
After birth, the course of action is less clear, she said, but lawyers advise that the child is to be
considered the patient, whose needs trump those of the parents. Since telling the father could trigger a
breakup and leave the child without proper support, the hospital keeps the secret. Sometimes it can be a
In one family with four daughters, the DNA analysis was so surprising that counselors asked the mother to
explain. "It turned out that the daughters had three different fathers," said Peter Ray, a scientist at the
hospital. "We cannot make any conclusions based on the family structures as they are presented to us."
In the research world, when scientists come across a father in a mismatched family, they toss the sample. If
pedigree errors are not caught, Dr. Scherer said, they can wreak statistical havoc with a study: "People
have made careers designing software to catch these kinds of things."
Sample mix-ups can skew results, as can an extremely rare condition discovered in 1989 in which a child
inherits two copies of the same chromosome from one parent, obscuring the contribution of the other. But as
the number of gene hunts and diagnostic tests has grown and grown, the leading cause of these anomalies has
proved to be mistaken fatherhood.
Some peg the range at 5 to 10 per cent; others, such as Jeanette Papp of the University of California at Los
Angeles, feel that 15 per cent is reasonable for the Western world, even if there is no hard evidence. "It's
hard to do studies on these things for ethical reasons," says Dr. Papp, director of genotyping and
sequencing in UCLA's department of human genetics. "I mean, how do you tell people what you're really
A British survey conducted between 1988 and 1996 by Robin Baker, a former professor at the University of
Manchester, confirmed the 10-per-cent figure. That seems high to skeptics such as Dalhousie University
geneticist Paul Neumann, although even he admitted that "my colleague, who's a woman, tells me women have no
trouble believing it. . . . It's the men who can't."
Bernard Dickens, a specialist in health law and policy at the University of Toronto, said that in another
British example, the non-paternity rate was three times that.
In the early 1970s, a schoolteacher in southern England assigned a class science project in which his
students were to find out the blood types of their parents. The students were then to use this information
to deduce their own blood types (because a gene from each parent determines your blood type, in most
instances only a certain number of combinations are possible). Instead, 30 per cent of the students
discovered their dads were not their biologically fathers.
"The classroom was, of course, not the ideal place to find out this information," said Prof. Dickens, who is
often consulted on ethical issues by geneticists at the Hospital for Sick Children.
He feels, as do many researchers, that culture can determine whether false paternity is very high or very
low. For example, in Muslim Egypt, the integrity of lineage is so important that neither sperm or egg
donation nor adoption is permitted, let alone sexual indiscretion.
But false paternity causes obvious problems for anyone who values a clear pedigree and makes it a
statistical impossibility to trace the true identity of our ancestors back more than a few generations.
Robert Moyzis, a molecular geneticist at the University of California at Irvine, recently had to break this
news to a friend who had spent considerable energy and resources compiling a family history that stretched
back 1,000 years. "I had to plug the numbers into a computer model and prove it to him. The chances that he
was related to the ancestor he thought were zero."
Logistically, it may seem that only men are naturally programmed for multiple partners. After all, they can
produce sperm by the thousands 24 hours a day, seven days a week, and do it well into their retirement
Women, on the other hand, are limited to the eggs they were born with, maturing one a month and not much
past their fourth decade of life. The precious few shots that women have at reproduction may drive them to
seek the best mate for prospective offspring -- though the decision might be wholly unconscious.
This notion is bolstered by the "sperm wars" theory, in which Britain's Dr. Baker has noted that sperm of
two different men can effectively battle over the spoils of fertilizing the egg in a woman's reproductive
In 1999, a questionnaire in Britain found that most women tended to be unfaithful to their long-term
partners around the time they were most fertile.
That same year, researchers at St. Andrew's University in Scotland concluded that women seem to desire
different types of men at different times of the month. When they are most likely to conceive, they are
attracted to men who have very masculine features, preferring more feminine men when they are not ovulating.
The researchers suggested that women may subconsciously feel that beefy men may make a better biological
contribution to a baby, but softer features may signal a better father.
And strangers may have a biological advantage. "There is actually data from Britain," said sexual-behaviour
expert Judith Lipton, "that suggests a woman may be more likely to conceive with a fresh partner because a
woman can essentially develop antibodies against her regular partner's sperm, so that she may be more likely
to be impregnated by fresh sperm."
Between 30 and 50 per cent of women cheat on their partners, compared with 50 to 80 per cent of men, said
Dr. Lipton, a psychiatrist with the Swedish Medical Center in Washington who last year co-wrote The Myth of
Monogamy with her husband, David Barash.
"This jibes with the idea that as many as 10 per cent of these relations may result in pregnancy," she said,
explaining that women may cheat as an escape from a bad marriage, for revenge on a cheating partner, to find
a better provider, or just for fun.
All this messing around might have been predicted by animal behaviour, but it has been only recently that
researchers learned just how hard faithful females are to find in any species.
Dr. Barash, a zoologist and professor of psychology at the University of Washington, explained that while it
was generally known that most mammals are rarely monogamous, certain species were held up as paragons of
virtue. Scientists believed, for example, fidelity was definitely for the birds. "But not even the swans are
monogamous, and they were the poster children for monogamy. Despite their waterfront property, they still
sneak around with the neighbours."
With the 1980s advent of DNA fingerprinting, a quick molecular test that, among other things, tells
scientists whether two creatures are genetically related, researchers have realized social monogamy has
little bearing on sexual monogamy in the animal kingdom.
"A lot of hanky-panky goes on even if two creatures set up house together," Dr. Barash said.
Despite thousands of hours of observation, birds managed to fool not only their mates into thinking they
were faithful, but their observers. Yet DNA tests show that 10 to 50 per cent of birds are fathered by a
male other than the one sharing the nest.
"We always knew the possibility was there for males to be available and receptive to EPC -- extra-pair
copulation -- but what was not known was that the mated females would do the same thing," Dr. Barash said.
In part, researchers figured females would be deterred from cheating since they had more to lose than a male
by fooling around -- their mate might stop foraging to feed the hungry offspring, cutting off the animal
equivalent of child support, or worse, turn violent. Yet this, he said, seems only to have inspired females
to perfect the art of secrecy and deception: They persistently sneak off in search of stronger genes, better
feeding grounds, good providers and protectors.
These trysts may have been overlooked, said Frances Burton, an anthropologist at the University of Toronto,
because the researchers were often male. "There is a weird double feedback thing that goes on when it comes
to observing animals, particularly non-human primates. We impose upon the observations human prejudices . .
. it can obfuscate whatever truth there is."
Even the fact that female animals actually derive enjoyment from copulation wasn't fully accepted until
1971, when Prof. Burton showed that female monkeys stimulated with an electric toothbrush did in fact reach
orgasm. "Though they rarely did with male monkeys," she added, "because the males did not engage them for
long enough periods."
Now the hope that fidelity is compatible with wildlife has all but vanished. DNA testing is crossing one
species after another off the list. Of 4,000 mammalian species, only 3 per cent are still considered
candidates. Birds, bees, snails, snakes, fish, frogs . . . not even mites are monogamous. You have slide
well down the food chain before Dr. Barash will put his money on a contender: Diplozoon paradoxum,a
parasitic flatworm found in the gills of freshwater fish. The first time two worms mate, their bodies are
fused together for life.
None of this should imply that humans are incapable of monogamy, he added. "Saying something is natural
is often used to justify unacceptable behaviour. It's natural to poop on the floor, but we spend a lot of
time becoming house broken."
His wife, however, said the moral transgression of infidelity cannot compare with the deception of lying
about paternity. She thinks paternity fraud should be considered a crime of the highest order.
"Reproductive deception is morally similar to rape," Dr. Lipton said. "If you trick someone into raising a
baby not his own, and he puts 20 years of his life into an endeavour based on a falsehood, that is
"If I were the queen of the world, birth control, of any form, would be available to any woman who wants it
and DNA testing would be available for all the men so that they would know who their babies are."
There are certainly those -- the "Duped Dads" among them -- who would agree with her.
Morgan Wise remembers how in 1999 the doctor rose from his chair, walked around the desk and sat down in
front of him. Mr. Wise's youngest son had been diagnosed with cystic fibrosis years earlier, but a medical
test showed Mr. Wise did not carry a CF gene.
"My first thought was that they must have misdiagnosed my son," the 40-year-old railway engineer from Big
Spring, Tex., said in an interview this week.
But then the doctor looked him squarely in the eye and said: "Morgan, do you have any reason to think this
boy might not be yours?"
The possibility seemed outlandish. He had been married to the same woman for 13 years and they had had three
boys and a girl before they broke up in 1996. But for peace of mind, he decided to go ahead with paternity
In March, 1999, the results arrived by mail -- a creased piece of paper telling him that not one of the
three boys was his.
"I felt anger toward [my first wife] and sadness, and I felt so sorry for my kids," Mr. Wise recalled. "I
told my boys, 'I love you all, you'll always be my sons, the only difference is now I'm not your birth
Despite this revelation, a district court judge ruled that Mr. Wise had to continue paying child support for
the three boys. Based on a 500-year-old common law, most states operate on the presumption that a husband is
the father of any child born to his wife during a marriage.
Mr. Wise took his case to the media, hoping to generate political support and contact other men in a similar
situation. Instead, he angered the judge, who revoked his visitation rights to the children but left him
responsible for $1,100 (U.S.) in monthly support.
"This," Mr. Wise warned, "could happen to anyone."
The Wise verdict has become a flashpoint for men who discover that their children are not their own. Many
are actually eager to find out, ordering paternity kits over the Internet. (The American Association of
Blood Banks reports that 30 per cent of men who suspect they are not biological fathers are right.)
Men have set up support groups and begun to lobby to change what they see as archaic laws. Three states have
bills pending that would take paternity fraud into account and at least three others have already passed
The Wise case also has focused legal minds and ethicists on the definition of fatherhood, and the prevailing
view appears to be that dad is the man who reads you bedtime stories, not necessarily the man who shares
In Canada, there has been no case in point. But Prof. Dickens at U of T said a recent ruling suggests that
Canadian courts would discount DNA evidence over the best interests of the child. A few years ago, he said,
a man tried to win visitation rights for a child he believed he had fathered with a woman who had since
married someone else.
The court ruled that the former boyfriend's biological contribution did not outweigh the risks of
compromising the bond the child had forged with the mother's husband. "If you have acted in a fatherlike way
toward a child, then you are the father," Prof. Dickens said. "Fatherhood is a social reality, not a genetic
He firmly believes that people who undergo genetic tests to find out about paternity are entitled to such
information. But those being tested for a genetic ailment or some other inherited trait cannot expect the
same: "It's not for geneticists to spring this information upon them. The point is, when you are testing for
a particular trait, it's either there or it's not there, and there is no need to say why it is or why it
Some fathers, of course, feel differently. Stacy Robb, founder and president of the support group DADS
Canada, said that "it's unfair because the doctors come across this information and they don't tell the man
listed as the father on the birth certificate. It's a disregarding of men's rights. The point is mothers and
fathers are not treated equally."
And as the staff at Hospital for Sick Children are learning, keeping secrets can backfire. In one case, a
father who tested negative for a gene that his sick child had inherited wrongly believes himself to be both
a carrier of a genetic disorder and the child's natural father.
Ms. Shuman said counselors have never told him otherwise, even after his marriage broke up. But recently,
he contacted the hospital again to say he has a new partner and wants to come in for further testing. He
assumes that any child produced in his new relationship also may be at risk.
Telling him there is no risk would reveal the truth about his first child. Going ahead with the test denies
him the truth about his own DNA.
Prof. Dickens suggests testing the new partner. If she turns out to be a non-carrier, there is no need of
further discussion. But Ms. Shuman said that also may leave counselors with some unwanted "moral residue."
"He hasn't come back in yet," she added, "but we may have to reveal the results . . . It all gets messier
than you might think. Welcome to my ethically charged world."
Written by Kristina Hansen
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