Under Islamic law, a woman's inheritance is typically half that of a man's according to verses in the Quran. This is because men bear financial responsibility for maintaining their families, whether it is their father/brother before marriage or their husband after marriage. So men receive a larger inheritance share to help fulfill these duties. However, there are some cases where a woman can inherit more, such as if the deceased is female with no children or siblings, then the mother inherits double the father's share. Overall, the Quran outlines specific inheritance shares for various family relationships to distribute wealth fairly according to Islamic principles.