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 Chromosomes: Morphology, Chromonema, Chromomeres, Telomeres, Primary & secondary constrictions, Chromatids Chromosome type- Polytene & Lampbrush  | 
Chromosomal Organization: Euchromatin, Heterochromatin , Nucleosome concept
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 Nucleosides, Nucleotides DNA, RNA DNA structure(A, B, Z type)  | 
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