A zygote is not a human being. Just because it contains DNA does not mean a zygote contains the characteristics of a human. How many times should we tell you this? A zygote does not possess a brain to think, nor arms, fingers, feet, toes, sentience. These are formed characteristics that make up the external and internal aspects of a human. Your position is continually flawed and in retrospect, speaking about biology 101 you are really failing miserably in your anti-abortion science stance.
The zygote is fully human. You mistake stage of development with it being fully human. The zygote is not fully developed any more than the infant, child, or adolescent is.