Besides natural selection, evolution is influenced by mechanisms like gene flow, the random walk of genetic drift, and the novelty-generating phenomenon of genetic mutations.

The forces of natural selection remove from the gene pool those lineages too unfit to survive in a given habitat, while those with good health survive to make healthy offspring, and their lineages tend to perpetuate.

A brief introduction to evolution, including its mechanisms, selective pressures, runaway effects, and the fundamental importance of evolution as a guiding force for the perpetuation of life.

Genetic information is complex; there's the gene sequence, the regulation of gene expression, and there are even mechanisms to modify genes, allowing a single gene to produce multiple different proteins.

The gene itself encodes raw information, but this is just the beginning of gene expression, which is a complex, highly-regulated, and tightly-coordinated process.

New DNA molecules are generated through a complex replication process, and mutations can be repaired with a variety of mechanisms.

The genome encodes information to 'build' the organism; the process of transcription encodes the DNA information into RNA, and translation encodes the information into polypeptide chains, which form proteins.

Meiosis is a specialized form of cellular replication, which creates many haploid daughter cells, each possessing a single copy of the genome.

A brief introduction to genetics, including the structure of DNA and RNA, gene expression, genome replication, and more.

As organisms a born, grow, reproduce, and die, so too do cells. The cell cycle is the pattern of cellular growth & replication that sustains life.