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NEET · Biology · STD 12 - 5. molecular basis of inheritance
Identify the correct order of organisation ofgenetic material from largest to smallest.
- A Genome, chromosome, gene, nucleotide
- B Chromosome, genome, nucleotide, gene
- C Chromosome, gene, genome, nucleotide
- D Genome, chromosome, nucleotide, gene
Answer & Solution
Correct Answer
(A) Genome, chromosome, gene, nucleotide
Step-by-step Solution
Detailed explanation
(a) : 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.
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