Washington: It`s known that intelligence is mostly inherited. But, whether a person can become a clever grandma or grandpa relies on both genes and environment, says a new study. Past studies of the genetics of intelligence have been performed on twins or siblings adopted and raised in different environments. Although the studies showed a genetic component of intelligence, they weren`t able to determine how this changes over a lifetime. But, the latest study by researchers at the University of Edinburgh in the UK found that both the genes and environment affect how a person`s intelligence changes as they age. "Until now, we have not had an estimate of how much genetic differences affect how people`s intelligence changes across the lifetime," lead researcher Ian Deary was quoted as saying by LiveScience. "These new results mean that researchers can seek both environmental and genetic contributions to successful cognitive ageing," he said. For their study, published in the journal Nature, the team studied a group of 1,940 Scottish people whose intelligence was measured when they were 11 years old. Theywere tracked down recently and had their intelligence measured again at an age that ranged between 65 and 79 years. The researchers also collected genomic data from blood samples and studied whether having similar genes impacted a person`s cognitive abilities at age 11 and later in life. The researchers didn`t identify the specific snippets of DNA involved in intelligence, but they were able to determine how much of a role having the "right" genes -- whatever theyare -- plays in lifelong intelligence.
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