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 $2$.

Column-$I$	Column-$II$	Column-$III$
$(1) \ 1952$	$(a)$ Watson and Crick	$(i)$ Double helix model of $DNA$
$(2) \ 1928$	$(b)$ Friedrich Miescher	$(ii)$ Proof that $DNA$ is genetic material
$(3) \ 1869$	$(c)$ Griffith	$(iii)$ Nuclein
$(4) \ 1953$	$(d)$ Hershey and Chase	$(iv)$ Transforming principle

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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.