The warrior gene is on the X-chromosome; hence, men inherit it from their mother. Since men have only one X-chromosome, the warrior gene is fully effective if present. In contrast, women have two X-chromosomes, which is why one single warrior gene either has no or less effect.
The MAOA gene is located on the X-chromosome. Males are more likely to display the characteristics associated with the warrior gene, as males only inherit one X chromosome. Females inherit two X chromosomes and the way that the warrior gene affects women is not well understood.