Karyogram


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Karyogram

 

the graphic representation of a karyotype, used in the quantitative characterization of each chromosome.

One type of karyogram is an idiogram, a rough sketch of the chromosomes arranged in rows according to length. Another type is a graph for which the coordinates are (1) lengths of the given chromosome (or a part thereof) or of the entire karyotype(for example, the relative length of the chromosomes) and (2) the so-called centromere index, that is, the ratio of the length of the short arm to that of the entire chromosome. The arrangement of each point on the karyogram reflects the distribution of the chromosomes in the karyotype. The main purpose of karyogramanalys is to detect heterogeneity in externally similar chromosomes of a given group.

References in periodicals archive ?
1]) that are highly similar, and conventional cytogenetic techniques have yielded preliminary karyograms for only three unrelated species: Arbacia punctulata (2n = 44--Auclair, 1965); Pseudocentrotus depressus, a strongylocentrotid urchin related to both species used in the current study (Lee, 2003; 2n = 42--Yamanaka et al.
The karyogram obtained by arranging the chromosomes in order of decreasing size and centromere position is shown on Figure 1c.
For each proband, 30 metaphases were counted and 5 metaphases were analyzed and karyograms were prepared using the Cytovision computer-assisted karyotyping system version 4.