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Question

In humans, most of the genomic sequences can be categorised as

A
Tandem repeats
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B
Coding sequences
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C
Regulatory sequences
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D
Repetitive DNA
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Solution

The correct option is D Repetitive DNA
The human genome project confers that approximately 50% of the human genome is made up of repetitive sequences. However, the term "repetitive sequences" encompasses a rather heterogeneous set of elements: 45% of the human genome is covered by transposons, 3% are repeats of less than a hundred base pairs (microsatellites and minisatellites), and 5% consist of recent duplications of large segments of DNA.

Coding DNA is defined as those sequences that can be transcribed into mRNA and translated into proteins during the human life cycle; these sequences occupy only a small fraction of the genome (<2%).

The human genome has many different regulatory sequences which are crucial to controlling gene expression. Conservative estimates indicate that these sequences make up 8% of the genome, however some estimates state that they maybe 20-40% of the genome.

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