Human karyotype showing 23 pairs of chromosomes, including autosomes and sex chromosomes, with visible banding patterns.

Karyotype A diagram showing paired human chromosomes, labeled 1-22 and sex chromosomes, with light and dark bands indicating genetic regions.

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1. 23 pairs of chromosomes.
2. Paired chromosomes are similar in size, shape, and banding pattern; they carry genes for the same traits at corresponding loci.
3. The sex is male, indicated by the presence of one X and one Y chromosome in the 23rd pair.
4. These regions are bands formed by differential staining, representing areas of varying chromatin density—light bands are gene-rich and less condensed; dark bands are gene-poor and more condensed.
5. Chromosomes generally decrease in size from chromosome 1 to chromosome 22.
6. Larger chromosomes typically contain more genes due to greater DNA content, while smaller chromosomes contain fewer genes.
7. 22 pairs of numbered chromosomes.

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