Sewall Wright, an American geneticist who conducted most of his research in the mid-twentieth century, researched the link between population genetics and evolution. Wright's research on the inheritance of coat color in certain species of mammals led to which correct conclusion?
a
Populations cannot develop helpful adaptations because of the interaction between genetic drift and natural selection.
b
Populations do not develop helpful or harmful adaptations from genetic drift or natural selection.
c
Populations develop helpful adaptations because of genetic drift and harmful adaptations from natural selection.
d
Populations develop helpful adaptations because of the interaction between genetic drift and natural selection.