CLASS IX NCERT SCIENCE Chapter 5 Fundamental Unit of Life : Cell
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Chromosomes Rod shaped structure only visible when the cell is about to divide. contain information for inheritance of features from parents to next generation in form of DNA ( deoxyribo nucleic acid) chromosomes contain 2 components- a) DNA b) proteins
cell chromosome nucleus DNA gene
DNA molecules contain information necessary for constructing and organizing cells Functional segment of DNA are called genes. Chromosome contain hereditary information in form of genes. When cell is not dividing , this DNA is present as a part of chromatin material. is entangled mass of thread like structures.
Functions Controls all the metabolic activities of cell. Regulates cell cycle. It is concerned with the transmission of hereditary traits from parents to offspring
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