Khan Academy on a Stick
Chromosomes, Chromatids, Chromatin, etc.
The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replication
If the above player doesn't work, you can try this direct link.
The vocabulary of DNA: chromosomes, chromatids, chromatin, transcription, translation, and replication
If the above player doesn't work, you can try this direct link.