Question

Which of the following statements regarding the human genome is incorrect?

• A. The human genome consists of $3\times {10}^9$ bp and about 20,500 genes
• B. The average gene size is 3000 bp and dystrophin is the largest known human gene.
• C. Chromosome 1 contains the most number (2968) of genes and the Y-chromosome has the least number of genes.
• D. Repetitive sequences are not present in the human genome.

Answer 1

The correct option is D Repetitive sequences are not present in the human genome.

Repetitive sequences make up a large portion of the human genome. These are nucleotide sequences that are repeated many times, sometimes a hundred to a thousand times. They have no direct coding function but provide information as to chromosome structure and dynamics, and evolution. They represent junk DNA.