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Karyotyping

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...

Karyotyping

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...

Lampbrush Chromosomes

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In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...

Polytene Chromosomes

Polytene Chromosomes

Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...

Incomplete Dominance

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.

X and Y Chromosomes

X and Y Chromosomes

Among mammals, the gender of an organism is determined by the sex chromosomes. Humans have two sex chromosomes, X and Y. Every human diploid cell has 22 pairs of autosomes and one pair of sex chromosomes. A human female has two X chromosomes, while a male has one X chromosome and one Y chromosome.
The germline cells such as egg and sperm cells carry only half the number of chromosomes, i.e., 22 autosomes and one sex chromosome. All eggs have an X chromosome, while sperm cells can carry an X or...

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Related Experiment Video

Updated: Jun 30, 2026

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

Published on: February 6, 2012

Working with canine chromosomes: current recommendations for karyotype description

N Reimann¹, S Bartnitzke, I Nolte

¹Center for Human Genetics and Genetic Counselling, University of Bremen, Germany.

The Journal of Heredity

|February 13, 1999

Summary

Genomic research in domestic dogs is challenging due to their complex karyotype. This review examines canine karyotype descriptions and proposes standardization for future genomic studies.

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Last Updated: Jun 30, 2026

Chromosomics: Detection of Numerical and Structural Alterations in All 24 Human Chromosomes Simultaneously Using a Novel OctoChrome FISH Assay

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Chromosome Preparation From Cultured Cells

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Published on: January 28, 2014

Area of Science:

Genetics
Comparative Genomics
Animal Cytogenetics

Background:

Genomic research in domestic dogs (Canis familiaris) is growing.
The canine karyotype presents challenges due to 76 acrocentric autosomes and metacentric sex chromosomes.
Existing canine karyotypes and ideograms lack universal acceptance.

Purpose of the Study:

To review existing descriptions of the canine karyotype.
To discuss recent nomenclatures and standardization efforts for the canine karyotype.
To provide recommendations for future canine karyotype nomenclature.

Main Methods:

Literature review of published canine karyotype descriptions.
Analysis of current standardization initiatives by the Committee for the Standardized Karyotype of the Dog.
Comparative analysis of different canine karyotype nomenclatures.

Main Results:

Multiple descriptions of the canine karyotype exist, but none are universally accepted.
Recent efforts are underway to standardize the canine karyotype nomenclature.
The complexity of the canine karyotype contributes to the lack of standardization.

Conclusions:

A standardized canine karyotype nomenclature is crucial for advancing genomic research.
Adoption of a unified nomenclature will improve consistency and comparability in canine genetics studies.
Recommendations are provided for the future use of a standardized canine karyotype nomenclature.