?congenital heart ?: The frequency of congenital heart defects is dependent on the interplay of genes on a variety of chromosomes along with environmental factors. Over time, our diagnostic & therapeutic capabilities have improved, but that might increase, not decrease the gene frequency & incidence over multiple generations.Survivors of once fatal chd now grow up & add to the gene pool.Diverse toxic exposures continue.
Answered 8/12/2012
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7 doctors weighed in across 3 answers
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