Question

In DNA, 20-100 base pairs which vary in every human being form ___________.

• A. Short nucleotide sequences
• B. Variable number of Tandem repeats
• C. Large nucleotide sequence
• D. Variable length of ss base pairs

Hint:

These are short repeated DNA stretches whose copy number differs from person to person and is used in DNA fingerprinting.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept
Human DNA has short stretches of about 20-100 base pairs that repeat one after another many times.

Step 2: Why they vary
The number of repeat copies differs in every individual (except identical twins), giving a unique band pattern.

Step 3: Name
These stretches are called variable number of tandem repeats (VNTRs), the basis of DNA fingerprinting.

Final Answer:
These sequences are variable number of tandem repeats. \[ \boxed{\text{(B) }\text{Variable number of Tandem repeats}} \]