Total number of genes in humans is far less (< 25,000) than previous estimate (upto 1,40,000 gene

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5.Molecular Basis of Inheritance

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The total number of genes in humans is far less $(< 25,000)$ than the previous estimate (upto $1,40,000$ gene). Comment.

Option A

Option B

Option C

Option D

Solution

Repeated sequences make up very large portion of the human genome. Repetitive sequences are stretches of $DNA$ sequences that are repeated many times, sometimes hundred to thousand times. They are thought to have no direct coding functions, but they shed light on chromosome structure, dynamics and evolution. Less than $2$ per cent of the genome codes for proteins.

Standard 12

Biology