Just changed and transferred
The answer to the 3rd question is that chromosomes are tightly coiled bundles of DNA and carry many genes. For the 4th question, asexual reproduction can occur by binary fission and creates exact genetic copies of a parent.
Yes, blood doping can improve your performance. Red blood cells contain lots of oxygen, thus, by filling your body with this oxygen-rich blood, you gain a lot more endurance and strength.