Polyploidy in plants
Polyploidy is very common in plants, especially in angiosperms. From 30% to 70% of today's angiosperms are thought to be polyploid. Species of coffee plant with 22, 44, 66, and 88 chromosomes are known.
Polyploidy is the condition of some biological cells and organisms manifested by the presence of more than two homologous sets of chromosomes.
polyploidy
the condition in which the number of chromosome sets in an individual or cell is three or more times the haploid set; 3n, 4n, etc.
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row ...
A polyploid formed from the doubling of a single genome. Polyploidy in which all the chromosomes come from the same species.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
polyploid
[Gk. polus, many + ploion, vessel]
Cell with more than two complete sets of chromosomes per nucleus.
polyploidy ...
polyploidy Abnormal variation in the number of chromosome sets. The condition when a cell or organism has more than the customary two sets of chromosomes.
Polyploid Having more than the normal two haploid sets of chromosomes.
Positional cloning Identification of a gene from no more starting information than its map position in the genome.
Primary constriction see centromere ...
Polyploid. A multiple of the haploid chromosome number that results from chromosome replication without nuclear division.
Polysaccharide. A polymer composed of multiple units of monosaccharide (simple sugar).
Polyploidy
Polyploidy is a condition in which there is more than 2 sets of chromosomes.
Triploids (3N), tetraploids (4N), pentaploids (5N) etc. are polyploids.
Polyploid
Having three or more (Gk. polys, many) sets of homologous chromosomes. The term was introduced by Strasburger (1910) by analogy with his earlier terms haploid and diploid.
-fold Greek prefix
1 ...
Polyploidy and hybridization are important speciation mechanisms in plants. Whereas animals tend to be unisexual, plants often have both sexes functional in the same individual.
polyploid An organism possessing more than two full homologous sets of chromosomes.
polyploidy Having more than two sets of chromosomes.
When used to induce polyploidy in plants, colchicine is usually applied to the plant as a cream. It has to be applied to a growth point of the plant, such as an apical tip, shoot or sucker.
Speciation through hybridization and/or polyploidy has long been considered much less important in animals than in plants [[[refs.]]]. A number of reviews suggest that this view may be mistaken.
Having two diploid sets of chromosomes each derived from a different parental species, an allopolyploid.
Related Terms:
Diploid
A full set of genetic material, consisting of paired chromosomes one chromosome from each parental set.
Also, unspecified multiple sets (but more than two) is polyploidy, and extremely large number of sets may be designated by number (for example 15-ploid for fifteen sets). The number of chromosome sets that make up the [[genome of an organism, e.g.
Non disjunction and changes in number (pre and post zygotic); polyploidy, aneuploidy, spontaneous abortions (SABs), advanced maternal age (AMA)
Changes in structure ...
 See also: Polyp, Chromosome, Chromosomes, Organ, Human
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