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Modern Genetic Analysis Chapter 2. The Structure of Genes and Genomes The Nature of Eukaryotic Nuclear Chromosomes
Table 2-4. Human Chromosomes

Group | Number | Diagrammatic representation | Relative length* | Centromeric index

Large chromosomes
A | 1 |  | 8.4 | 48 (M)
| 2 |  | 8.0 | 39
| 3 |  | 6.8 | 47 (M)
B | 4 |  | 6.3 | 29
| 5 |  | 6.1 | 29
Medium chromosomes
C | 6 |  | 5.9 | 39
| 7 |  | 5.4 | 39
| 8 |  | 4.9 | 34
| 9 |  | 4.8 | 35
| 10 |  | 4.6 | 34
| 11 |  | 4.6 | 40
| 12 |  | 4.7 | 30
D | 13 |  | 3.7 | 17 (A)
| 14 |  | 3.6 | 19 (A)
| 15 |  | 3.5 | 20 (A)
Small chromosomes
E | 16 |  | 3.4 | 41
| 17 |  | 3.3 | 34
| 18 |  | 2.9 | 31
F | 19 |  | 2.7 | 47 (M)
| 20 |  | 2.6 | 45 (M)
G | 21 |  | 1.9 | 31
| 22 |  | 2.0 | 30
Sex chromosomes
| X |  | 5.1 (group C) | 40
| Y |  | 2.2 (group G) | 27 (A)

* Percentage of the total combined length of a haploid set of 22 autosomes. Percentage of chromosome's length spanned by its short arm. The four most metacentric chromosomes are indicated by an (M); the four most acrocentric by an (A).

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