Protein-Coding DNA in Human Genome — NEET Biology
✅ Asked in NEET 2025What percentage of the human genome codes for proteins? (NEET 2025)
What percentage of the human genome codes for proteins? (NEET 2025)
Answer & NCERT explanation
Correct answer: C — 2%
According to Human Genome Project findings, only about 2% of the human genome actually codes for proteins. The majority consists of non-coding regions including introns, regulatory sequences, and repetitive DNA. This surprising discovery showed that most of our genome doesn't directly code for proteins, contradicting earlier expectations that a larger percentage would be protein-coding.
Read more NCERT concept on the PYQ
Less than 2 per cent of the genome codes for proteins.
Only ~2% of the human genome actually codes for proteins; the rest consists of introns, regulatory sequences, and non-coding DNA. Students often mistakenly assume most DNA has a direct function or that all non-coding DNA is 'junk DNA'—this is incorrect. The key concept NTA tests is understanding that coding sequences are a tiny fraction of total genome, yet humans are complex organisms, highlighting that gene regulation and non-coding elements play crucial regulatory roles. Remember: less protein-coding DNA doesn't mean the rest is useless; introns, promoters, enhancers, and other regulatory sequences control when and how genes are expressed.
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