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

Options

A. Chromosome, gene, genome, nucleotide
B. Genome, chromosome, nucleotide, gene
C. Genome, chromosome, gene, nucleotide
D. Chromosome, genome, nucleotide, gene

Answer

To identify the correct order of organization of genetic material from largest to smallest, we need to understand the hierarchy of genetic structures. Here’s the step-by-step solution:

### Step 1: Understand the Basic Units of Genetic Material
- The smallest unit of genetic material is the **nucleotide**, which is composed of a nitrogen base, a sugar molecule, and a phosphate group.

**Hint:** Remember that nucleotides are the building blocks of DNA.

### Step 2: Formation of Genes
- Multiple nucleotides join together to form a **gene**. A gene is a specific sequence of nucleotides that encodes for a protein or a functional RNA.

**Hint:** Think of genes as segments of DNA that have specific functions.

### Step 3: Organization into Chromosomes
- Genes are organized and located on structures called **chromosomes**. Each chromosome contains many genes and is made up of DNA tightly coiled around proteins.

**Hint:** Chromosomes can be visualized as long strands of DNA that contain many genes.

### Step 4: Total Genetic Content
- The complete set of genetic material in an organism is referred to as the **genome**. The genome includes all of the organism's chromosomes and thus all of its genes.

**Hint:** The genome represents the entire genetic blueprint of an organism.

### Step 5: Arrange in Order from Largest to Smallest
- Now, we can arrange these components in order from largest to smallest:
1. **Genome** (largest)
2. **Chromosome**
3. **Gene**
4. **Nucleotide** (smallest)

### Final Answer
The correct order of organization of genetic material from largest to smallest is:
**Genome > Chromosome > Gene > Nucleotide**