< b>F (coefficient of inbreeding): F is the symbol for the coefficient of
inbreeding, a way of gauging how close two people are genetically to one another.
The coefficient of inbreeding, F, is the probability that a person with two identical
genes received both genes from one ancestor.
Take, for example, the mating of first cousins who, by definition, share a set
of grandparents. For any particular gene in the male, the chance that his female
first cousin inherited the same gene from the same source is 1/8. Further, for any
gene the man passes to his child, the chance is 1/8 that the woman has the same
gene and ½ that she transmits that gene to the child so 1/8 X ½ = 1/16. Thus, a
first-cousin marriage has a coefficient of inbreeding F =1/16.
The added risks for the offspring of first cousins depend not only upon the coefficient
of inbreeding but also upon the genetic family history and test results. For example,
first cousins of Italian descent are at increased risk of carrying a gene for beta
thalassemia and genetic laboratory tests may confirm that they are both beta-thalassemia
gene carriers.
There are always added risks in the mating of closely related persons and those
risks are not entirely negligible.
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