With a fixed mindset, people believe their basic qualities, like their intelligence or talent, are simply fixed traits. (slaw.ca)
In a fixed mindset students believe their basic abilities, their intelligence, their talents, are just fixed traits. (edutopia.org)
In the first half of the 20th century, neo-Darwinism became the name for the people who reconciled the type of gradual evolutionary change described by Charles Darwin with Gregor Mendel's rules of heredity [which first gained widespread recognition around 1900], in which fixed traits are passed from one generation to the next. (discovermagazine.com)