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  4. Identify the correct order of organisation of genetic material from largest to smallest.

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Q. Identify the correct order of organisation of genetic material from largest to smallest.

AIPMTAIPMT 2015Molecular Basis of Inheritance

Solution:

In genome all the genes are contained in a single set of chromosomes. The instructions in our genome are present in the form of DNA. DNA has a complicated structure in the form of a double helix. Single strands of DNA are coiled up into structures called chromosomes. Within the chromosomes, segments of DNA are 'read' together to form genes. Thus, a gene is a segment of DNA or chromosome situated at a specific locus (gene locus) which carries coded information associated with a specific function and can undergo crossing over as well as mutation. A nucleotide is the basic unit of DNA made up of a pentose sugar, phosphoric acid and a nitrogenous base.