Confused about how chromosome numbers change before and after mitosis and meiosis? This Amoeba Sisters UPDATED video breaks down chromosome vs chromatid and shows how to count chromosomes and how they change in cell division, all...

Paul Andersen reviews the major concepts within the fifth unit of the new AP Biology framework. He starts with a description of both DNA and RNA. He explains how DNA is copied during the S phase of mitosis. He explains how...

Hank describes mitosis and cytokinesis - the series of processes our cells go through to divide into two identical copies.

Explore chromosomes and karyotypes with the Amoeba Sisters! This video explains chromosome structure, how chromosomes are counted, why chromosomes are important, and how they can be arranged in a karyotype! This video also tackles a few...

In this video, we will explore the many similar terms in genetics that start with the letter, C: chromosome, chromatin, chromatin, and more.

Meiosis Set: 2. This clip provides a detailed look at the phases of meiosis and the production of haploid sex cells.