Many immigrant groups in Europe are known for having a high occurrence of consanguineous marriages, or incestuous unions. The issue with this can be summarized as follows: children born to closely related parents have a lower degree of heterozygosity because a significant portion of their genes comes from the same individual—for example, from a grandparent in the case of cousins. In other words, these individuals inherit identical gene variants more frequently than others.
As a result, genes that usually appear in humans as a single copy without affecting their outward characteristics, or phenotype, become visible. Among these genes, there are often many defective variants in one way or another.
The rarity of these recessive genetic defects is due to natural selection, which works against them. It operates in such a way that individuals with an observable genetic defect tend to have fewer offspring than others. Consequently, their genes do not pass on to future generations as effectively as those of other individuals.
It’s important to note that recessive genetic defects are not always clearly visible diseases. Often, they are only mildly harmful and thus primarily affect an individual’s vitality—for example, by impairing physical or mental performance—and are not considered outright diseases.
Since recessive gene variants only affect people when inherited from both parents, children born from consanguineous marriages are more likely to have disabilities. Even the seemingly healthy offspring of such unions tend to have, on average, fewer abilities than other people.
This is likely one of the most significant reasons why certain immigrant groups have struggled to succeed in Western societies, and it strongly influences the poor learning abilities observed in their children.
For this reason, consanguineous marriages should not be a taboo or off-limits topic in an increasingly diverse society but, rather, the opposite. And because this is a growing issue, the public—especially those from cultures that favor consanguinity—must be educated on the negative consequences of this tradition.
In other words, incestuous unions and their harmful societal effects must be openly discussed!
This should also be addressed—especially in schools—even if some students are themselves the offspring of cousin marriages. It is essential for them to understand this issue, break the harmful tradition of their culture, and choose spouses from outside their family.
It’s worth emphasizing that the hereditary harms caused by consanguineous marriage disappear entirely within a single generation. Therefore, even the descendants of the most inbred members of the most incestuous cultures are not doomed to the bottom of society—provided they understand the importance of not procreating with a relative.
Previous thoughts on the same topic:
Finnish Society Adopts Medieval Characteristics
Freudian slip, 9-year-old girl and cultural appropriation
Cousin is not just a delicacy, but also a hindrance to social success
In many countries with this kind of behavior, the cause is to keep the land owned in the family. The effects can be disastrous.
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