Genetic advantage in interracial mating

Dear colleagues:

I while ago I remember attending a lecture by a knowledgeable geneticist who
explained the biological and genetic basis for the fact that the mixture of
races is beneficial from a genetic standpoint as it tends to favor
offsprings increasing their chances of survival.

If my memory serves me right, the explanation had something to do with the
fact that genes responsible for causing many different diseases tend
sometimes to be race-specific, having evolved in specific parts of the
planet and affecting the population restricted to that area through the
process of evolution. The closer your mating partner is to your race, the
more likely it is that you both had a common ancestor from which the gene
derived and the greater the possibility of both manifesting the gene which
is a requirement for many diseases (dominant versus recessive genetic
diseases).

This genetic premise explains the fact that the more races are mixed with
one another, the more these genes become diluted and less prone to manifest
themselves. This in turn leads to a "stronger" race as the product of the
mixture of individuals with different racial characteristics.

Is this the right explanation for this phenomenon ? What can you share with
me about this process ?

What would be a good text to read to find the explanation for this
phenomenon and would it be described in detail ? In case a text is not
available, is there a web site where I could find detailed biological
information on the genetic base behind this phenomenon ?

Any help you can offer me will be greatly appreciated.

Best regards,

Joseph Chamberlain, D.D.S.
Oral and Maxillofacial Surgery

.

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