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Updated Biology Courses cardella

General Biology
Prof. Bryan Cardella, M.Ed.

ap biology eaton

AP Biology 
Dr. Carleen Eaton, M.D.

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Eukaryotic Genomes

  • A eukaryotic cell has millions of base pairs of DNA that it must keep organized. During cell division, all of the DNA in a cell is replicated and segregated to the daughter cells. In order to keep the DNA organized, DNA is packaged into manageable pieces called chromosomes.

  • In this Lesson, we'll discuss the packaging of DNA in eukaryotic cells and see how it affects gene expression.

  • The levels of DNA packaging provide a mechanism for regulating transcription. DNA that contains many genes is not packaged as tightly as DNA that contains few genes, so it's more accessible for transcription.