One of the surprises to come out of the was that humans have far fewer than 100,000 genes, the number scientists thought most likely throughout the twentieth century.

Human Genome Project

Explanation:

The Human Genome Project was an international scientific research project with the goal of determining the base pairs that make up human DNA, and of identifying and mapping all of the genes of the human genome from both a physical and a functional standpoint.

d we did this already