Khan Academy Static

One of the major goals of dividing cells is to split up their DNA as perfectly as possible. (Incorrect division of DNA = chance of a nonfunctional cell, or even cancer!) Learn how DNA combines with proteins to form chromosomes, why different types of cells have different chromosome numbers, and what the parts of a chromosome are.

9652_Zygote_differentiating_into_somatic_and_germ_cells.html

9651_Fertilization_terminology_gametes_zygotes_haploid_diploid.html

9653_Chromosomes_chromatids_and_chromatin.html