The X-chromosome is one of the two sex chromosomes in humans, the other being the Y-chromosome. It is significantly larger than the Y-chromosome and carries a variety of genes that are important for many bodily functions. Both males and females have X-chromosomes, but females have two copies (XX), while males have one X and one Y (XY). In humans, the X-chromosome is crucial for determining certain traits and conditions. For example, some genetic disorders, such as hemophilia and color blindness, are linked to mutations on the X-chromosome. Because males have only one X-chromosome, they are more likely to express these conditions if they inherit a mutated gene.