Chromosomes (article) | Khan Academy
https://en.khanacademy.org/science/high-school-biology/hs-reproduction-and-cell-division/hs-chromosome-structure-and-numbers/a/dna-and-chromosomes-article
WEBHigh school biology. Course: High school biology > Unit 4. Chromosomes. Google Classroom. DNA, chromosomes, and genomes. Homologous chromosomes, sister chromatids, and haploid/diploid. Introduction. When a cell divides, one of its main jobs is to make sure that each of the two new cells gets a full, perfect copy of genetic material.
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