How do parents pass their genes into a child?
Um, they have sex. The genes from each parent combine to form the baby, and the baby has character traits of both parents.
Very very carefully.
The same way all other living species do to reproduce..
breast milk..is one way..
When the two parents reproduce and procreate a life. The rest is all God and/or nature.
The female gene is in her egg and the male's is in his sperm. The two things combine to form an embryo, which grows into a baby and that's how the baby ends up with both genes.