Read following statements (1-4).
1. In transcriptoin, adenine pairs with uracil.
2. Regulation of lac operon by repressor is referred to as positive regulation.
3. The human genome has approximately 50,000 genes.
4. Haemophilia is a sex - linked recessive disease.
How many of the above statements are right ?
A. Two
B. Three
C. Four
D. One
