The union of ovum and sperm during fertilization creates the first cell of the new organism which is called a

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The zygote is formed when the sperm and ovum unite during fertilization. This is the first cell of the new individual and is diploid, containing a full set of chromosomes from each parent. A morula is a stage of embryo development that occurs after the zygote undergoes several rounds of cell division, while a blastocyst is a later stage where the embryo has differentiated into two distinct cell types and has formed a fluid-filled cavity. The zona pellucida is a glycoprotein layer that surrounds the egg cell and is shed after fertilization.

The Union of Ovum and Sperm During Fertilization Creates the First