Polymerase, DNA
An enzyme that catalyzes (speeds) the polymerization of DNA. DNA polymerase uses preexisting nucleic acid templates and assembles the DNA from deoxyribonucleotides.
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- Polymerase, RNA
The enzyme that makes the very large molecule RNA, by joining together many smaller molecules, using DNA as a template.
- Polymorphic
Pertaining to a polymorphism, a variation in the DNA that is too common to be due merely to new mutation. A polymorphism must have a frequency of at least 1% in the population. Examples of polymorphic genes include those for sickle cell disease, thalassemia and G6PD deficiency. These genes are widely believed to offer an […]
- Polymorphic light eruption
Polymorphic light eruption is a common skin reaction to sunlight that occurs most commonly in people with fair skin. Polymorphic light eruption results in small red raised spots and blisters on the skin within four days after exposure to ultraviolet radiation, such as from sunlight. The term polymorphic means that the skin reaction may take […]
- Polymorphism
A variation in the DNA that is too common to be due merely to new mutation. A polymorphism must have a frequency of at least 1% in the population. Examples of polymorphisms include the genes for sickle cell disease, thalassemia and G6PD deficiency. These genes are widely believed to offer an advantage against malaria.
- Polymorphonuclear leukocyte
A type of white blood cell with a nucleus that is so deeply lobated or divided that the cell looks to have multiple nuclei. Informally called a poly.