During natural selection, the environment selects the “best” genes.

The enzyme responsible for building DNA is:

Mutations may be caused by exposure to:

During DNA replication, each strand serves as a pattern or template:

Suppose a man who is heterozygous for freckles (dominant) and heterozygous for tongue rolling (dominant) is crossed with a woman who is heterozygous for freckles and heterozygous for tongue rolling. What is the probability of them having a child without freckles and without the ability to roll their tongue?

A genotype of PwT would illustrate:

DNA can be obtained from teeth, blood, and even incinerated bone:

Suppose you have the genotype AaBb. How many different gametes can form from this genotype?

Contrast the signs and symptoms of peritonitis and pancreatitis.

The purines and pyrimidines are held together in DNA by these bonds: