Read the following four statements (1 to 4):1 | vedclass

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(C) Let us analyze each statement:$1$. In transcription,$DNA$ is transcribed into $RNA$. Adenine $(A)$ in $DNA$ pairs with Uracil $(U)$ in $RNA$. This

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(C) Let us analyze each statement:$1$. In transcription,$DNA$ is transcribed into $RNA$. Adenine $(A)$ in $DNA$ pairs with Uracil $(U)$ in $RNA$. This statement is correct.$2$. Regulation of $lac$ operon by a repressor is called negative regulation,not positive regulation. Positive regulation involves activators like $CAP$. This statement is incorrect.$3$. The human genome is estimated to contain approximately $20,000$ to $25,000$ genes,not $50,000$. This statement is incorrect.$4$. Haemophilia is a well-known sex-linked recessive disorder caused by a defect in blood clotting factors. This statement is correct.Thus,statements $1$ and $4$ are correct. The total number of correct statements is $2$.

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