Question

When scientists first started mapping human genes, they estimated that there were about 2 million genes. By the late 1990s, it was thought that there were only 100,000 genes, and then that number shrank to 19,000 in 2001. Most scientists now believe that humans have about 21,000 genes.

Which statement describes these estimates?

They became more accurate over time.

They became less accurate over time.

They were more accurate and then less accurate.

The accuracy remained the same.

Answer 1

the first statement holds true according to me