Interbreeding is where cousins and other close relatives have children together.  Almost all cultures have compelling veto’s opposing it, first and foremost because of the growing chances of birth defects.

Still in the scenic Australian valley there’s a gloomy and worrying secret where unwashed children are born from generations of incest and that are living with physical malformations in a sect of 40 adults and youngsters, it has emerged.

Of course, there can be some extremely serious results to inbreeding, especially when it’s continuous over numerous generations.

Genetic diversity is significant, and inbreeding wears that down.  There are some considerable, disastrous samples of the dangers of ongoing inbreeding.

And in a faraway valley in Australia brothers and sisters, uncles and aunts had sex with one another over four generations.  Raising children in dirty conditions whom themselves grew up to be familiar and have additional inbred children.

Yet the reality is that two cousins with no previous past of inbreeding in the family don’t have a much significant chance of birth deficiencies in their children than an unconnected couple and, in fact, slightly more distant relatives appear to assemble healthier children than the general population.

So let’s put taboos to one side and inspect what the upshot of inbreeding in fact are.  While the perils of inbreeding are in general exaggerated, they unquestionably do exist and, can get quite extreme over many generations.

Together with those children found in a small hollow in Australia living in dirty huts and, broken down caravans that had many impairments from their inbred births, comprising a boy with a walking handicap and acute psoriasis, one more with hearing and sight complications and yet another boy whose eyes were misaligned.

The problem is all about recessive genes because while almost all of the genes that we carry are either beneficial or impartial in makeup, or else we wouldn’t remain alive and, we all have a few genes that have the probability to have a severe negative impact on our well-being.


These are recognised as autosomal recessive disorders and, they comprise of cystic fibrosis, sickle cell anaemia, Tay-Sachs disease, albinism and, a diversification of other conditions.


A nine year old girl, who couldn’t hear or write and, had broken and hindered speech was powerless to take a bath, or dry herself and, didn’t know to use a bathroom, was the uncovering of the family’s perverted life in the valley, lying south west of Sydney.

Stomach-churning details of generations of child mistreatment were issued, illustrating on a judgement from the New South Wales Children’s Court, which was extremely unusual and, agreed to make its discovery public.

The name of the concealed valley has been kept private and, the family’s has been given the pen name Colt in order to keep protected the names of the minors, but particulars of the degraded existence of adults and children have been released because it’s agreed-upon the court felt the country should know about the worst instance of incest it had ever heard.

Although these children had impediments and speech imperfections, we’re all couriers of these potentially harmful genes.  With inbreeding, however, we’re discussing about family members who already share an abnormal percentage of their genes.

Cousins, for example, have a relationship coefficient of about 12.5%, meaning an average an eighth of their genes are the same by descent.  So let’s look at a straightforward theoretical and think about the case of two cousins who bear the same dangerous recessive gene, say the one connected to cystic fibrosis, who marry and have four children.

Of four of the kids, we would presume one to become heir to both ruling alleles, implying she is no longer a carrier.  Two of the children would bequeath one dominant and one recessive allele, meaning they are still carriers.

One child would be left with both recessive alleles, signifying he would suffer from cystic fibrosis and, in a single generation of inbreeding, the chance of cystic fibrosis has hypothetically skipped in percentage for the children of this particular inbreeding.


That’s a frightening skip in percentage and, for a great deal that growing unpredictability is expected to validate all the taboos about the risks of inbreeding.  And, it would be foolish to pretend such risks don’t happen.

Nevertheless, while we all carry the genes for such potentially fatal conditions, not all autosomal recessive disorders are so simply turned on, with a great deal needing many generations of inbreeding before it becomes a grave worry.

There does tend to be a steady drop in procreative robustness and general health and, children of inbreeding are inclined to have more problems having children and are somewhat unhealthy and that get worse over time, but those don’t prevent such children from living rich, filled lives.

Professor Alan Bittles, a professor at the Centre of Comparative Genomics at Australia’s Murdoch University, who has exerted himself on the matter for over three decades established that there were increased risks, but not quite to the degree that we might visualise.


While there’s about a 2% chance of birth deformities in the widespread population, first cousin children have around a 4% chance.  Of course, you can term that in any number of ways, contingent on how you want to spin it.

On one hand, that means that there’s double the chance of birth imperfections in the children of first cousins.  On the other hand, 96% of such children are born totally healthy, which is still the huge majority.

Generally speaking, these are slight enlargements, scarcely the kind of guaranteed heinous results that are frequently connected with inbreeding and, all that displays is that inbreeding isn’t as harmful as we often believe, a declaration worth making to be sure of, but in all likelihood not completely earth shattering.

We now have to study beyond first cousins to more far off relations, specifically third cousins, people who share a mutual set of great great grandparents.  Their kinship coefficient isn’t enormous, just 1/128, but that still means about 200 of their 23,000 protein coding genes are indistinguishable by descent, a level of relationship easily noticed by geneticists and, as eerie as it might sound, third cousin marriages in fact might produce healthier children than the general population.



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