How many of the given statements (i-iv) is/ar | vedclass

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(A) Statement $(i)$ is correct: During transcription,adenosine $(A)$ pairs with uracil $(U)$ in $RNA$.Statement $(ii)$ is incorrect: Regulation of the

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Two

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(A) Statement $(i)$ is correct: During transcription,adenosine $(A)$ pairs with uracil $(U)$ in $RNA$.Statement $(ii)$ is incorrect: Regulation of the $lac$ operon by a repressor is referred to as negative regulation,as the repressor protein binds to the operator to inhibit transcription.Statement $(iii)$ is incorrect: The human genome contains approximately $20,000-25,000$ genes,not $50,000$.Statement $(iv)$ is correct: Haemophilia is a well-known sex-linked recessive disorder.Therefore,statements $(i)$ and $(iv)$ are correct. The total number of correct statements is $2$.

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How many of the given statements $(i-iv)$ is/are correct?$i.$ In transcription,adenosine pairs with uracil.$ii.$ Regulation of lac operon by repressor is referred to as positive regulation.$iii.$ The human genome has approximately $50,000$ genes.$iv.$ Haemophilia is a sex-linked recessive disease.