Articles

Glossary - Letter T


Talophyte - Term that defines vegetables without conductive tissue and that do not distinguish the main body (stem) from leaves and branches.

Telocentric - Chromosome where the centromere is displaced to the terminal part. (see centromere). Telophase - Last phase of cell division. It is characterized by chromosome despiralation, reorganization of the library, reappearance of the nucleolus and cytokinesis.

Teratogenic - chemical that, ingested by a female, can cause deformities in the child he or she generates. Examples include thalidomide, mercury, etc.
Testosterone - Male hormone, produced by certain testicular cells (interstitial or Leydig cells) induces the sexual drive and the appearance of male secondary sexual characteristics.

Thyroid - Neck endocrine gland whose hormones (thyroxine and triodothyronine) control the body's general metabolism

Tolerance - Ability to withstand environmental variations to a greater or lesser extent. To identify an organism's tolerance levels, the prefixes euri, which means broad, or stene, meaning limited, are used. Thus, an animal that withstands a wide range of ambient temperatures is called euriterm, while an organism that has little tolerance for this same factor is called a stenotherm.

Transduction - The transfer of genetic material (DNA) from one bacterium to another by a lysogenic bacteriophage.

Tracheophyte - Tracheophyta Division; plant with sap-conducting vessel systems (vascular); they are the phyllicins (see pteridophyte), gymnosperms and angiosperms.

Turner - See Turner syndrome.

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