Khan Academy
Khan Academy: Chromosomes
This informative resource features an overview of genetic material: DNA, chromosomes, genomes, homologous chromosomes, sister chromatids, and haploid/diploid.
Khan Academy
Khan Academy: Cell Cycle Checkpoints
Learn how cells use checkpoints to regulate the cell cycle. This article provides an overview of cell cycle control, outlining the factors that influence a cell's decision to pause or progress at each checkpoint.
Khan Academy
Khan Academy: Cell Cycle Regulators
This article looks at a few of the most important core cell cycle regulators: proteins called cyclins, enzymes called Cdks, and an enzyme complex called the APC/C.
Khan Academy
Khan Academy: Meiosis
In this tutorial students will learn how meiosis reduces chromosome number by half and become familiar with crossing over, meiosis I, meiosis II, and genetic variation.
Khan Academy
Khan Academy: Sexual Life Cycles
Tutorial takes a look at the three types of sexual life cycles used by different organisms: diploid-dominant, haploid-dominant, and alternation of generations.