The biological, genetic, scientific fact is that when a spermatozoon (male sperm cell) penetrates an oocyte (female egg cell), the 23 male chromosomes mix with the 23 female chromosomes and form a zygote, a single cell that is uniquely human and contains 100% of the genetic information of a new person. The zygote is a human being, the only difference with a fully mature adult being the stage of development. That single cell is biologically and genetically every bit as human as you and I. (Online for Life)