The Transformation Of Human Development

1431 Words Sep 10th, 2016 6 Pages
Chapter 2 “The Beginning from conception to birth” illustrates that the human development begins even at a stage of one’s life that has not even formed yet. “Every person starts life as a single cell, called a zygote.” (Berger, 48) The zygote contains characteristics that create universal and unique characteristics of each human (Berger, 48) The universal characteristics that each unit of life contains molecules that are full of information and instructions called DNA. Human development begins from zygote to newborn in which “prenatal development is divided into three categories: Germinal period, Embryonic period, and fetal period.” (Berger, 58) The Germinal Period appears begins during the first 2 weeks after conception. “The zygote begins duplication and division,” in which the 23 pairs of chromosomes duplicate and divide to for new cells that also go through the same process, from one cell duplicating into two, then four, and then eight, and continuing on. Stem cells are the first cells processed to complete the characteristics of an individual by allowing these cells to create others. (Berger, 58) A process called differentiation determines which cells are going to function as what and where. For example, some cells will be sent to create and take control of the eyes. All cells have important tasks and jobs that they are assigned. The last stages of this period uses “other cells to form a shell that will become the placenta” in which it surrounds and protects the…
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