Final answer:
The cell formed by the union of the ovum and sperm is called a zygote. It contains a full set of genetic material from both parents and will develop into an embryo.
Step-by-step explanation:
The cell formed by the union of the ovum and sperm is called a zygote. The zygote is the initial cell that forms when the sperm fertilizes the egg. It contains a full set of genetic material from both parents and will undergo multiple divisions to develop into an embryo.
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