chromosome

American  

[kroh-muh-sohm] / ˈkroʊ məˌsoʊm /

noun

Genetics.

• chromosomes
  plural

1. any of several threadlike bodies, consisting of chromatin, that carry the genes in a linear order: the human species has 23 pairs, designated 1 to 22 in order of decreasing size and X and Y for the sex-determining chromosomes.

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chromosome British  

/ ˈkrəʊməˌsəʊm /

noun

1. any of the microscopic rod-shaped structures that appear in a cell nucleus during cell division, consisting of nucleoprotein arranged into units (genes) that are responsible for the transmission of hereditary characteristics See also homologous chromosomes

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chromosome Scientific  

/ krō′mə-sōm′ /

1. A structure in all living cells that consists of a single molecule of DNA bonded to various proteins and that carries the genes determining heredity. In all eukaryotic cells, the chromosomes occur as threadlike strands in the nucleus. During cell reproduction, these strands coil up and condense into much thicker structures that are easily viewed under a microscope. Chromosomes occur in pairs in all of the cells of eukaryotes except the reproductive cells, which have one of each chromosome, and some red blood cells (such as those of mammals) that expel their nuclei. In bacterial cells and other prokaryotes, which have no nucleus, the chromosome is a circular strand of DNA located in the cytoplasm.

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Other Word Forms

Derived Forms

• chromosomal
  adjective
• interchromosomal
  adjective
• nonchromosomal
  adjective
• chromosomally
  adverb
• interchromosomally
  adverb

Inflected Forms

Nouns

• chromosomes
  plural

Etymology

Origin of chromosome

First recorded in 1885–90; chromo- + -some ³

Compare meaning

How does chromosome compare to similar and commonly confused words? Explore the most common comparisons:

• chromatin vs. chromosome
• chromosome vs. chromatid
• plasmid vs. chromosome

Explanation

A chromosome is a strand of DNA that is encoded with genes. In most cells, humans have 22 pairs of these chromosomes plus the two sex chromosomes (XX in females and XY in males) for a total of 46. The word chromosome was originally coined in German from the Greek words khroma, meaning "color," and soma meaning "body." In the late 1800s, a scientist, Wilhelm von Waldeyer-Hartz, gave chromosomes their name because chromosomes easily accept dye and take on patterns of light and dark when exposed to different stains that help identify the different chromosomes.

Example Sentences

See Examples For:

chromosome chromosomes

The team found that differences in chromosome numbers among animal groups can arise in two main ways.

From Science Daily ● Aug. 25, 2026

Because the process cannot be reversed, a major chromosome detour can permanently influence where a lineage ends up in what researchers describe as "genome-architecture space."

From Science Daily ● Aug. 25, 2026

The Year 8 student from Western Australia has Down Syndrome – a genetic condition caused by an extra copy of chromosome 21 which leads to physical and intellectual disabilities.

From BBC ● Aug. 12, 2026

The protein does not operate exclusively at chromosome ends.

From Science Daily ● Aug. 2, 2026

The abnormality consists of the loss of part of a chromosome.

From "Silent Spring" by Rachel Carson

They can reveal which genes an animal possesses without showing exactly where those genes are positioned along its chromosomes.

From Science Daily ● Aug. 25, 2026

Since that time, chromosomes have repeatedly fused, separated, and been rearranged as new animal lineages emerged.

From Science Daily ● Aug. 25, 2026

Chromosome-scale assemblies provide much more detail by arranging genes in their proper order across complete chromosomes.

From Science Daily ● Aug. 25, 2026

Instead, most were located on autosomes, the non sex chromosomes shared by males and females.

From Science Daily ● Aug. 20, 2026

But for now, in a fragile peace dominated by the buzz of flies, they immersed themselves in experiments on genes and chromosomes.

From "The Gene" by Siddhartha Mukherjee