What is DNA (Deoxyribonucleic Acid)?:
http://www.khanacademy.org/science/biology/v/dna
Chromosomes, Chromatids & Chromatin : http://www.khanacademy.org/science/biology/v/chromosomes--chromatids--chromatin--etc
Mitosis, Meiosis & Sexual Reproduction: http://www.khanacademy.org/science/biology/v/mitosis--meiosis-and-sexual-reproduction
Phases of Mitosis:
http://www.khanacademy.org/science/biology/v/phases-of-mitosis
Phases of Meiosis:
http://www.khanacademy.org/science/biology/v/phases-of-meiosis
How Cells Divide Tutorial (Comparing Mitosis & Meiosis):
http://www.pbs.org/wgbh/nova/miracle/divi_flash.html
http://www.pbs.org/wgbh/nova/body/how-cells-divide.html
Mitosis Animation:
http://www.youtube.com/watch?v=AhgRhXl7w_g&feature=fvsr
http://www.youtube.com/watch?v=VGV3fv-uZYI&feature=related
Meiosis Animation:
http://www.youtube.com/watch?v=D1_-mQS_FZ0
Gametogenesis: http://wps.aw.com/bc_martini_eap_4/40/10469/2680298.cw/content/index.html
Comparing Mitosis and Meiosis Animation:
http://www.youtube.com/watch?v=Ba9LXKH2ztU&feature=related
The Discovery of DNA Structure:
http://www.youtube.com/watch?v=sf0YXnAFBs8
TED Lecture: James Watson discusses how he discovered the stucture of DNA:
http://www.ted.com/talks/lang/en/james_watson_on_how_he_discovered_dna.html
Linus Pauling: Triple Helix Mistake:
http://lpi.oregonstate.edu/ss03/triplehelix.html
DNA Structure & Replication:
http://www.youtube.com/watch?v=wkXgwGn_dGU&feature=related
Guess the Embryo: http://www.pbs.org/wgbh/nova/evolution/guess-embryo.html