What does tetraploid mean?
Tetraploid describes an organism or cell that has four complete sets of chromosomes rather than the usual two found in a diploid organism. The adjective and noun are both common in genetics, plant breeding, evolutionary biology, and cytology. A tetraploid cell therefore contains four copies of each chromosome normally present in a diploid cell, although its total chromosome number depends on the species' base chromosome count. Tetraploidy can arise through chromosome duplication, the fusion of chromosome sets, or chromosome multiplication following fertilization. It is studied for its effects on fertility, traits, diversity, and agricultural usefulness. Although tetraploidy is a form of polyploidy, the term specifically identifies the four-set condition. In general writing, the word is best reserved for technical contexts in which the number and arrangement of chromosome sets are central to the discussion.
Having four complete sets of chromosomes; characterized by tetraploidy.
"The tetraploid variety produced larger fruit than the diploid plants."
Common in genetics, cytology, plant breeding, and evolutionary biology.
An organism or cell that possesses four complete sets of chromosomes.
"The tetraploid was crossbred with a diploid variety to study chromosome inheritance."
The plural tetraploids is used for organisms or cells with four complete chromosome sets.
The plural is used for organisms or cells having four complete sets of chromosomes.
"Several tetraploids were identified among the plants growing on the experimental plot."
Four chromosome sets, four copies: tetraploid is biology's label for a cell or organism carrying an extra full set of genetic material.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does tetraploid come from?
The word was formed in the early 20th century from Greek tetra-, meaning “four,” and the biological combining form -ploid, which ultimately refers to form or number of chromosome sets. Its terminology developed alongside modern cytology and genetics as researchers classified organisms by their number of chromosome sets. The Greek element tetra- also appears in many English words, including tetrahedron and tetracycline.
Related word forms
How tetraploid is actually used
This is formal scientific terminology, especially common in genetics, plant breeding, and cytology. It is not normally used in general conversation. When used as a noun, it normally refers to an organism or cell rather than an entire chromosome set.
Easily confused with tetraploid
A tetraploid has four complete chromosome sets, whereas a tetrapod is an animal with four limbs.