42 Z
zygote (ZĪ-gōt): Process of fertilization is complete and results in a single-celled diploid zygote with all the genetic instructions it needs to develop into a human.
zygote intrafallopian transfer (ZIFT): Mixing of the ova and sperm in a laboratory. Fertilization is confirmed to grow into zygotes and then are inserted into the Fallopian tubes.