diploid

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Related to diploidy: haploidy, polyploidy

diploid

Biology (of cells or organisms) having pairs of homologous chromosomes so that twice the haploid number is present
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Diploid

 

an organism whose cells have a double (diploid; 2n) set of chromosomes, representing a single (haploid; n) set of paired homologous chromosomes. For example, man has 23 pairs of chromosomes (n = 23’,2n = 46), and an onion has eight pairs of chromosomes (n = 8; 2n = 16). The transition from the diploid state (diplophase) to the haploid (haplo-phase) is accomplished by the first meiotic division, as a result of which the sex cells, or gametes, are formed. When the gametes fuse, the diploid number of chromosomes is restored.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

diploid

[′di‚plȯid]
(crystallography)
A crystal form in the isometric system having 24 similar quadrilateral faces arranged in pairs.
(genetics)
Having two complete chromosome pairs in a nucleus (2N).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
These results may suggest that most aneuploid Yesso scallops died before the D-larvae stage, and aneuploid individuals closest to euploidy, especially diploidy, survived longer.
For example, recent data have shown that a small percentage of triploid oysters progressively revert toward diploidy with age (Calvo et al., 2001; Zhou, 2002).
"Many people consider diploidy to be the pinnacle of evolution," Otto says.
Some authors found increasing age to be related to increased stage at presentation, while others found in elderly women more favourable prognostic factors such as high diploidy values and oestrogen receptor positivity.
Previous studies have suggested that embryos with 3PN, which develop from ICSI zygotes, are endowed with mechanisms to correct triploidy to diploidy. 62.5% of ICSI 3PN embryos were found to progress back to the blastocyst stage, whereas 54.5% were heteroparental diploid blastocysts (5).
With NGS and highly sensitive PCR technologies, mutations should be identifiable in specimens with as little as 10% tumor (mutant allele frequency of 5% assuming heterozygosity and diploidy).
Evidence of diploidy in the wild Amerindian yam, a putative progenitor of the endangered species Dioscorea trifida (Dioscoreaceae).
In vitro androgenesis has been the mainstream approach in the production of pure lines via haploids which is later doubled to restore the diploidy [8].
Mac rocephaly in bull spermatozoa is associated with nuclear vacuoles, diploidy and alteration of chromatin condensation.
Because only one chromosome is examined in this assay, diploidy cannot be distinguished from disomy of chromosome 1.
Chromosome counts were made as additional data to evaluate diploidy or polyploidy using tissues of juveniles (~300 [micro]m in length) brooded within the parental gills, and following the protocol described by Jara-Seguel et al.
In both groups, the mean frequencies of chromosome 18 disomy were within the normal range: the means of frequency of diploidy and sex chromosome disomy were higher than reference values, but only diploidy reached statistical significance (P = 0.01) in group I.