For, as scientists acknowledge, ‘women are the race itself, the strong primary sex, and man the biological afterthought.’ In human cell structure, women’s is the basic 'X’ chromosome; a female baby simply collects another 'X’ at the moment of conception, while the creation of a male requires the branching off of the divergent 'Y’ chromosome, seen by some as a genetic error, a 'deformed and broken “X”.’ The woman’s egg, several hundred times bigger than the sperm that fertilizes it, carries all the primary genetic messages the child will ever receive.  Women therefore are the original, the first sex, the biological norm from which males are only a derivation.  Historian Amaury de Riencourt sums it up: 'Far from being an incomplete form of maleness, according to a tradition stretching from the biblical Genesis to Aristotle to Thomas Aquinas, femaleness is the norm, the fundamental form of life.’
—  Rosalind Miles, Who Cooked the Last Supper?: The Women’s History of the World