Dad pretty much only donates a haploid nucleus to the embryo, mom provides an egg and all the nutrients and organelles needed. Thats about it. We had a long discussion once in my cellular evolution class about how males are evolutionarily really insignificant, some animals have even eliminated the need for males to reproduce. We consume half the resources, if not more, and only donate a haploid nucleus to the process of reproducing. I thought it was a pretty comical discussion. Sorry but that was kind of off topic. I hope I answered your question.