A zygote is the product of the fusion of an egg and a sperm. It contains two copies of each chromosome, one from each parent. Egg and sperms cells, on the other hand, each contain only one copy of each chromosome.
No. Baclofen is a muscle relaxer and an anti-spastic agent.
Baclofen, at standard dosing, does not produce euphoria or other pleasant effects, does not possess addictive properties, and has not been associated with any degree of drug craving. There are very few cases of abuse of baclofen for reasons other than attempted suicide.