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 ...
Allopolyploidy - Definition of Allopolyploidy at Dictionary.com a free online ... allopolyploidy - 2 dictionary results. allopolyploid ...
Full article ...
polyploidy
(pol-ee-ploid-ee)
A chromosomal alteration in which the organism possesses more than two complete chromosome sets.
polyribosome ...
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.
Polyploidy
Polyploidy is a condition in which there is more than 2 sets of chromosomes.
Triploids (3N), tetraploids (4N), pentaploids (5N) etc. are polyploids.
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.
polyploidy Having more than two sets of chromosomes.
polypod larva Caterpillar type of larva found in Lepidoptera and some Hymenoptera. It has thoracic appendages and abdominal locomotory processes (prolegs). Also called cruciform.
Autopolyploidy
Polyploidy in which all the chromosomes come from the same species; the polyploid is formed by the doubling of a single genome.
Related Terms:
Polyploid
Having three or more (Gk. polys, many) sets of homologous chromosomes.
Allopolyploidy
Polyploidy resulting from an interspecific cross (thus containing two different genomes).
Related Terms:
Polyploid
Having three or more (Gk. polys, many) sets of homologous chromosomes.
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.
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 ...
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 ...
 See also: Ploidy, Chromosome, Polyploid, Chromosomes, Polyp
|
