Illustration of human chromosomes and red blood cells. Each chromosome consists of a DNA double helix bearing a linear sequence of genes, coiled and recoiled around aggregated proteins. Their number varies from species to species. Humans have 22 pairs plus the two sex chromosomes (two X chromosomes in females, one X and one Y in males). | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / Allen, Steve |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |