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ScienceDaily (May 3, 2010) — New research suggests that Charles Darwin's family was a living human example of a theory that he developed about plants: that inbreeding could negatively affect the health and number of resulting offspring.
Darwin was married to his first cousin, Emma Wedgwood. They had 10 children, but three died before age 10, two from infectious diseases. And three of the six surviving children with long-term marriages did not produce any offspring -- a "suspicious" sign, researchers say, that these Darwins could have had reproductive problems because of their lineage.
Studies have shown that susceptibility to infectious disease and unexplained infertility are risk factors of consanguineous marriage -- unions of people related by birth.
Scientists at Ohio State University and in Spain traced the genealogy of the Darwin and Wedgwood families for four generations. Darwin's mother and grandfather also were Wedgwoods, and his mother's parents were third cousins.
The researchers used these data to run calculations in a specialized computer program to determine what is called an "inbreeding coefficient," or the probability that an individual received two identical copies of a gene resulting from marriages among relatives.