Which one of the following features is not correct for the human genome?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → More than 2 percent of the genome codes for proteins
The Human Genome Project gave these main findings.
(1) Human genome contains 3164.7 million bp — Correct for the human genome. This is the size of the genome.
(2) More than 2 percent of the genome codes for proteins — Not correct for the human genome. It is less than 2 per cent. The rest is non-coding DNA.
(3) Total number of genes is estimated at 30,000 — Correct for the human genome. This is much lower than the earlier estimates of 80,000 to 1,40,000.
(4) Functions are unknown for over 50 percent of the discovered genes — Correct for the human genome. The roles of more than half of the discovered genes are not yet known.
Note: A similar question was also asked in CUET (UG) 2026 on 20-05-2026 (Slot 1).
NCERT Extract:
Salient Features of Human Genome – “… Some of the salient observations drawn from human genome project are as follows: (i) The human genome contains 3164.7 million bp. (ii) The average gene consists of 3000 bases, but sizes vary greatly, with the largest known human gene being dystrophin at 2.4 million bases. (iii) The total number of genes is estimated at 30,000– much lower than previous estimates of 80,000 to 1,40,000 genes. Almost all (99.9 per cent) nucleotide bases are exactly the same in all humans. (iv) The functions are unknown for over 50 per cent of the discovered genes. (v) Less than 2 per cent of the genome codes for proteins.”