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| [Totipotent] | a cell that is totipotent has the potential to become any differentiated, or specialized, cell in the body, including extra-embryonic tissuses (such as a placenta). totipotent cells are found in the zygote, and begin to specialize a few days after fertilization and after several cycles of cell division.
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| [Tissue] | a group of cells that have a similar structure and function. many different tissue types can make up an organ.
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| [Tetrasomy] | four copies of a particular chromosome present in a cell, for a total of 48 chromosomes in the cell instead of the typical number, 46 chromosomes.
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| [Tetraploidy] | four copies of every chromosome in a cell, for a total of 92 chromosomes, instead of the typical number, 46 chromosomes.
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| [Syndrome] | a recognizable pattern or group of characteristics or symptoms.
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| [Sperm] | the male reproductive cell. the sperm carries 23 chromosomes, 22 autosomes and an x chromosome or a y chromosome. the sperm fuses with the ovum at conception to produce an embryo.
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| [Somatic origin] | originatingin£¬a somatic cell
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| [Somatic mutation] | a change occurring in any cell that is not destined to become a reproductive cell.
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| [Somatic cells] | all the cells in the body except the reproductive cells.
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| [Sister chromatids] | two exact copies of a chromosome attached together by the centromeres.
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