A person can only show a recessive trait if both of their parents carried at least one copy of each of the recessive allele. The parents do not need to show the trait, as one copy is not enough to reveal it, but they must both carry it.
Hope this helped!
A stem cell is a body cell,that is basically isnt used for reproduction.
The answer that fits the given blank is GENE POOL OVER TIME. The Modern Synthesis is a theory that is a combination of Mendel's and Darwin's study of evolution and genetics. And this theory affirms that the changes in population's gene pool over time is being involves evolution.
I am almost certain it was the discovery of bacteria. Hope this helped you hunn
