Select output fields
| Family | Genus | Specific epithet | Specific authority | Infraspecific category | |
| 2C mean1(pg) | 2C mean1(mbp) | 2C range1 pg | |||
| Chromosome number (2n) | Ploidy level | ||||
| Number of 5S signals | Range of 5S signals | Position2 of 5S signals (5S P) | |||
| Number of 45S3 signals | Range of 45S signals | Position2 of 45S signals (45S P) | Arrangement | ||
| Autosome or sex chromosome | 5S chrom. type | ||||
| Sex chrom. number | 45S chrom. type | ||||
| B chromosomes | Ag-NOR | ||||
| Original reference | |||||
Write conditions
| Family Genus Specific epithet | |||||
| Chromosome number from: - Ploidy level from: - |
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For help with searching and querying the database, go to HELP
1 source: Animal genome size database (http://www.genomesize.com)
2 position refers to interstitial, pericentromeric, distal or occupying whole chromosome arm
3 refers to 45S rDNA (18S-5.8S-26S rRNA genes)
Ribosomal DNA loci encoding ribosomal RNA genes (rDNA) are important components of chromosomes. Their number and positions on chromosomes are important characteristics of karyotypes. Information is used in a wide range of biological fields including evolutionary biology, phylogenetics, systematics or animal breeding.
The animal rDNA database provides currently information on number and position of rDNA loci for 2800 animal species from 340 families.
The data of this second release comes from 1040 papers based on in situ hybridization of 5S and 45S rDNA, published until March 2021. You can also find several new features in advanced search, such as type of the chromosome bearing rDNA (autosome, sex chromosome, B chromosome) or the number of Ag-NORs reflecting activity of rDNA loci.
We thank the authors of publications for providing source data. Any corrections, suggestions for improvement or new information are wellcomed. These should be addressed to: sochorova@ibp.cz and kovarik@ibp.cz.
(*) Fluorescent in situ hybridisation
NOTE: The database is not providing any rDNA sequence, only information about rDNA site number and position in chromosomes. If you are interested in sequence data, you can consult other databases listed here.
