Is a blastoderm the same as sperm?

The answer is no because sperm is produce everyday and ova is produce periodicaly

They both contain 1/2 the number of chromosomes of a "normal" cell. They don't contain the necessary organelles to survive on their own. They both can create a zygote (if they are combined). Both are...

Semen is the ejaculate that contains sperm and other items. So as far as the danger of pregnancy goes, they should be considered the same thing.

Yes sperm and semen are both the same thing.

No. Sperm are gametes (sex cell), sperm is a male sex cell and isn't the same as deoxyribonucleic acid (DNA). DNA is the genetic make-up of all living things.