Darwin called the same phenomenon the “correlation of growth” and geneticist today study what they call “pleiotropic effects.”
When Ellie was 18 months old, their pediatrician, now at a loss for other explanation, suggested they return to a geneticist.
The geneticist also told them there would be a risk to Sarah in carrying a child with either syndrome.
geneticist ge·net·i·cist (jə-nět'ĭ-sĭst)
A specialist in genetics.