What does haploid mean?
Haploid is a biology and genetics term describing an organism, cell, or nucleus that has one set of chromosomes. In most sexually reproducing species, including humans, ordinary body cells are diploid, meaning they contain two chromosome sets: one inherited from each parent. Reproductive cells called gametes, however, are haploid because they contain only one set. Haploid organisms also occur naturally, including many fungi, algae, and some plants and animals. The adjective is especially common in expressions such as “haploid cell,” “haploid organism,” and “haploid gamete.” As a noun, a haploid is a cell or organism with one chromosome set. The word is precise and technical, but it is useful for understanding the central distinction between the chromosome number present in a gamete and that found in the rest of a sexually reproducing organism.
Having one set of chromosomes, rather than the two sets characteristic of most sexually reproducing organisms.
"The haploid cell contains chromosomes inherited from only one parent."
Standard technical terminology in biology and genetics.
A cell or organism with one set of chromosomes, especially a reproductive cell such as a gamete.
"A gamete is a haploid that can fuse with another gamete during fertilization."
Used chiefly in formal biological and genetic contexts.
The plural is used when referring to multiple cells or organisms with one chromosome set.
"The researchers compared the genomes of several haploids."
A human egg or sperm is haploid, while almost every ordinary body cell is diploid.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does haploid come from?
The word comes from Greek hapl- or haplos, meaning “single,” combined with the suffix -oid, associated with Greek eidos, meaning “form.” It entered English biological usage in the 19th century as a term for cells or organisms with one set of chromosomes. Related formations such as haplotype, haplogroup, and haplophyte use the same Greek element for “single.”
How haploid is actually used
The word is technical and formal, used primarily in biology, genetics, and related fields. As a noun, it usually refers to a cell or organism rather than to a chromosome set itself.
Easily confused with haploid
Haploid means having one set of chromosomes, whereas diploid means having two sets, one inherited from each parent.