A zygote is a fertilized egg cell which occurs after the male sperm meets with the female ovum, or egg, during the sexual reproductive process. The zygote stage is the very first stage of the development of the human embryo. The zygote contains all of the DNA information from both parents.
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A zygote is a bit like a blueprint for the fetus that will develop. For example, the zygote has the chromosome that will determine its sex, but it will not develop distinguishable reproductive organs until the fourth month of pregnancy.