BSIP, ESTIOT / SCIENCE PHOTO LIBRARY BSIP, ESTIOT / SCIENCE PHOTO LIBRARY
Male chromosome set. Computer illustration of the complete set (karyotype) of chromosomes in a healthy human male. Humans have 46 chromosomes in most cells, divided into 23 pairs containing one from each parent. Males differ from females only in the last (23rd) pair. In males this consists of an X- and a Y-shaped chromosome (as seen at lower right). In females this is a pair of X-shaped chromosomes. Chromosomes contain deoxyribonucleic acid (DNA) which is responsible for passing genetic information from parents to their offspring. The DNA is divided into sections called genes. Genes on the Y chromosome cause the development of male features.
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