heterochromia

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heterochromia

[‚hed·ə·rō′krō·mē·ə]
(physiology)
A condition in which the two irises of an individual have different colors, or in which one iris has two colors.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
elatius accessions had a heterochromatic C-band in the long arm of the satellited chromosome (chromosome 4), although this band was very faint in PI 251946 (Fig.
Similarly, Abucarma and Martins-Santos (2001) reported an intense positive CM[A.sub.3] signal on the metacentric B chromosome of Rhamdia branneri Haseman, 1911, in the telomeric heterochromatic region.
The Spanish and French populations studied by Shaw (1971a) carry centromeric heterochromatic blocks on all autosomes, with M4, M6 and M9 chromosomes bearing additional blocks.
The objectives of this study were to characterize the distribution of constitutive heterochromatic DNA in tetraploid Chilean germplasm, identify chromosomal abnormalities, develop a karyotype of Chilean alfalfa, compare the Chilean karyotype with the reference African karyotype, and determine if cluster and multiple correspondence analyses could be used to distinguish chromosomes of different germplasm sources.
The objectives of this study were to determine the distribution of constitutive heterochromatic DNA, characterize the polymorphisms which might exist, and develop a reference karyotype of tetraploid alfalfa based on the nondormant germplasm source African Population, utilizing the combined techniques of C-banding and image analysis.
Hence, very high AFLP marker densities may occur near chromosome centromeres or other suppressed recombination areas (e.g., large heterochromatic blocks) because of the heavy methylation of DNA in these regions.
Nuclei of the Schwann cells were heterochromatic and pyknotic with prominent cytoplasmic eosinophilia.
In addition, the Hofbauer cells expanded into the endoplasmic reticulum, the mitochondria were swollen, and the nucleus was heterochromatic. A focal increase was observed in the thickness of the endothelial basal membrane in most of the placentas.
Heterochromatic flicker photometry (HFP) is a psychophysical method to test MPOD that most clinicians are familiar with.
Thus, they lead to a heterochromatic condition that is not transcriptionally active.