(AP) — Darrell Dixon’s father was just 25 when he had a major heart attack in the rural Mississippi Delta. By his early 40s, a series of additional attacks had left his heart muscle too weak to pump enough blood to his body. He died in 2013 at the age of 49.
“It was a big jolt for our family,” Dixon, 36, recalled. “For myself, personally, it also got me thinking about heredity. I just wondered whet…
