Paul Andersen explains how changes in the genotype of an individual can affect the phenotype. He begins with genotype:phenotype::letters:story analogy. He explains how mutations can be neutral, beneficial or harmful. He also explains how...

This lesson will explain how traits are passed down by alleles, and that one particular genotype determines one particular phenotype. It is 1 of 3 in the series titled "Traits." [1 min. 8 sec.]