chromomere

chro·mo·mere

C0339000 (krō′mə-mîr′)n. One of the serially aligned beadlike granules of concentrated chromatin that constitutes a chromosome during the early phases of cell division.

chro′mo·mer′ic (-mĕr′ĭk, -mîr′-) adj.

chromomere

(ˈkrəʊməˌmɪə) n (Biology) cytology any of the dense areas of chromatin along the length of a chromosome during the early stages of cell division

chro•mo•mere

(ˈkroʊ məˌmɪər)

n. one of the beadlike granules arranged in a linear series in a chromonema. [1895–1900] chro`mo•mer′ic (-ˈmɛr ɪk, -ˈmɪər-) adj.

Chromomere

chromomere

[′krō·mō‚mir] (cell and molecular biology) Any of the linearly arranged chromatin granules in leptotene and pachytene chromosomes and in polytene nuclei.

Chromomere

a thickened, tightly coiled group of deoxyribonucleoprotein threads (chromonemata) that comprise the chromosome; they stain strongly with nuclear dyes. Under a microscope, the chromomere is easily discernible during the prophase of meiosis and mitosis, appearing in the form of dark granules arranged in a specific order along the chromosome thread.

The chromomeres contain up to 95 percent of the deoxyribonucleic acid (DNA) in the chromosome; the remaining 5 percent is contained in the uncoiled areas between the chromomeres. The shape, size, and number of chromomeres are strictly constant for each chromosome and form a pattern of chromomeres that is individualized according to species, tissue, and age. The chromomeres of different organisms range in size from 500 angstroms to 0.5 micron, and their DNA content ranges from 10³–10⁶ pairs of nucleotides, respectively. Very large chromomeres, called nodules, have been discovered during the prophase of meiosis in some plants; they serve as precise chromosome markers in cytogenetic research.

When giant polytene chromosomes form, their homologous chromomeres conjugate closely in pairs, forming disks whose pattern, like that of chromomeres, is specific for each chromosome. In many disks of polytene chromosomes, the loci of certain genes have been established by means of cytogenetic analysis. Traditional genetics viewed chromomeres and disks as cytological equivalents of a single gene or of several genes. Most modern cytogeneticists, on the other hand, regard chromomeres as functional units of the chromosome that include structural genes with regulatory areas. According to an opposing hypothesis, chromomeres are inactivated areas of a chromosome that are not identical to any information units.

I. I. KIKNADZE

chromomere

[kro´mo-mēr] 1. any of the beadlike granules occurring in series along a chromonema.2. granulomere.

chro·mo·mere

(krō'mō-mēr), 1. A condensed segment of a chromonema; densely staining bands visible in chromosomes under certain conditions. 2. Synonym(s): granulomere [chromo- + G. meros, a part]

chromomere

(krō′mə-mîr′)n. One of the serially aligned beadlike granules of concentrated chromatin that constitutes a chromosome during the early phases of cell division.

chro′mo·mer′ic (-mĕr′ĭk, -mîr′-) adj.

chro·mo·mere

(krō'mō-mēr) 1. A condensed segment of a chromonema; densely staining bands visible in chromosomes under certain conditions. 2. Synonym(s): granulomere. [chromo- + G. meros, a part]

chromomere

one of many densely staining bands across the SALIVARY GLAND CHROMOSOMES of certain insects, each of which are thought to represent the actual location of a different gene group.

单词	chromomere
释义	chromomere chro·mo·mere C0339000 (krō′mə-mîr′)n. One of the serially aligned beadlike granules of concentrated chromatin that constitutes a chromosome during the early phases of cell division. chro′mo·mer′ic (-mĕr′ĭk, -mîr′-) adj. chromomere (ˈkrəʊməˌmɪə) n (Biology) cytology any of the dense areas of chromatin along the length of a chromosome during the early stages of cell division chro•mo•mere (ˈkroʊ məˌmɪər) n. one of the beadlike granules arranged in a linear series in a chromonema. [1895–1900] chro`mo•mer′ic (-ˈmɛr ɪk, -ˈmɪər-) adj. Chromomere chromomere [′krō·mō‚mir] (cell and molecular biology) Any of the linearly arranged chromatin granules in leptotene and pachytene chromosomes and in polytene nuclei. Chromomere a thickened, tightly coiled group of deoxyribonucleoprotein threads (chromonemata) that comprise the chromosome; they stain strongly with nuclear dyes. Under a microscope, the chromomere is easily discernible during the prophase of meiosis and mitosis, appearing in the form of dark granules arranged in a specific order along the chromosome thread. The chromomeres contain up to 95 percent of the deoxyribonucleic acid (DNA) in the chromosome; the remaining 5 percent is contained in the uncoiled areas between the chromomeres. The shape, size, and number of chromomeres are strictly constant for each chromosome and form a pattern of chromomeres that is individualized according to species, tissue, and age. The chromomeres of different organisms range in size from 500 angstroms to 0.5 micron, and their DNA content ranges from 10³–10⁶ pairs of nucleotides, respectively. Very large chromomeres, called nodules, have been discovered during the prophase of meiosis in some plants; they serve as precise chromosome markers in cytogenetic research. When giant polytene chromosomes form, their homologous chromomeres conjugate closely in pairs, forming disks whose pattern, like that of chromomeres, is specific for each chromosome. In many disks of polytene chromosomes, the loci of certain genes have been established by means of cytogenetic analysis. Traditional genetics viewed chromomeres and disks as cytological equivalents of a single gene or of several genes. Most modern cytogeneticists, on the other hand, regard chromomeres as functional units of the chromosome that include structural genes with regulatory areas. According to an opposing hypothesis, chromomeres are inactivated areas of a chromosome that are not identical to any information units. I. I. KIKNADZE chromomere chromomere [kro´mo-mēr] 1. any of the beadlike granules occurring in series along a chromonema.2. granulomere. chro·mo·mere (krō'mō-mēr), 1. A condensed segment of a chromonema; densely staining bands visible in chromosomes under certain conditions. 2. Synonym(s): granulomere [chromo- + G. meros, a part] chromomere (krō′mə-mîr′)n. One of the serially aligned beadlike granules of concentrated chromatin that constitutes a chromosome during the early phases of cell division. chro′mo·mer′ic (-mĕr′ĭk, -mîr′-) adj. chro·mo·mere (krō'mō-mēr) 1. A condensed segment of a chromonema; densely staining bands visible in chromosomes under certain conditions. 2. Synonym(s): granulomere. [chromo- + G. meros, a part] chromomere one of many densely staining bands across the SALIVARY GLAND CHROMOSOMES of certain insects, each of which are thought to represent the actual location of a different gene group.
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