Comment on the utility of variability in number of tansem repeats during DNA fingerprinting .

Explanation

**Step-by-Step Solution:**

1. **Understanding Tandem Repeats**: Tandem repeats are sequences of DNA where a pattern of one or more nucleotides is repeated directly adjacent to each other. Variability in the number of these repeats can occur between individuals.

2. **Role in DNA Fingerprinting**: DNA fingerprinting is a technique used to identify individuals based on their unique DNA profiles. Variability in tandem repeats, particularly in regions known as Variable Number Tandem Repeats (VNTRs), is crucial for this process.

3. **Gel Electrophoresis**: The first step in DNA fingerprinting involves subjecting the DNA sample to gel electrophoresis. This technique separates DNA fragments based on their size. VNTRs will appear as distinct bands on the gel, representing different lengths of DNA fragments.

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