In some cases there appears to be a genetic association.
An interesting genetic association has been made between joint laxity and anxiety disorders.
"Well, implausible as it might be, it's easier than arguing against a genetic association," Merton said.
The genetic association of timing is strongest between mothers and daughters.
It has also been suggested that variants in this enzyme may be part of a genetic association with hypercholesterolemia.
But for now, it's too early to know how extensive genetic associations are among friends, or how important and influential these genotype clusters may be.
However, it is now known that there are many different genetic associations with this condition.
There was once thought to be a genetic association with the EMX2 gene, although this theory has recently lost support.
An integrated, searchable knowledge base of genetic associations and human genome epidemiology.
Strong evidence of genetic association with increased risk for AA was found by studying families with two or more affected members.