28:05

DNA

18:24

Mitosis, Meiosis and Sexual Reproduction

23:17

Viruses

13:24

Homologous chromosomes, sister chromatids, bivalents etc. explained

19:54

Embryonic stem cells | Cells | MCAT | Khan Academy

27:23

Phases of Meiosis

21:04

Parts of a cell

7:33

Chromosomes and Karyotypes