Notes from NEET topper
Levels of DNA Packaging
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Nucleosome: The basic unit of DNA packaging in eukaryotes. It consists of DNA wrapped around histone proteins.
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Chromatin Fiber: Nucleosomes are further folded into a higher-order structure called chromatin fiber.
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Looped Domain (300nm): Chromatin loops attach to a protein scaffold, creating looped domains.
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Heterochromatin (700nm): Highly condensed and transcriptionally inactive regions of chromatin.
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DNA Compaction: The progressive compaction of DNA through multiple levels of organization.
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Formation of Metaphase Chromosome (1400nm): Chromosomes are fully condensed during mitosis and meiosis, facilitating their segregation.
