(27) And God created the human in his image, in the image of God He created him, male and female He created them.
Robert Alter Commentary on Verse 1:27
In the middle clause of this verse, "him," as in the Hebrew, is grammatically but not anatomically masculine. Feminist critics have raised the question as to whether here and in the second account of human origins, in chapter 2, 'adam is to be imagined as sexually undifferentiated until the fashioning of woman, though that proposal leads to certain dizzying paradoxes in following the story.
(א) ויבן ה' אלהים את הצלע - ר' אלעזר בשם רבי יוסי בן זמרא אמר: ניתן בה בינה יותר מן האיש. דתנינן: בת י"א שנה ויום אחד נדריה נבדקין, בת י"ב שנה ויום אחד נדריה קיימין ובודקין כל י"ב, אבל לזכר בן י"ב שנה ויום אחד נדריו נבדקין, בן י"ג נדריו קיימין ובודקין כל י"ג.
(1) "And God built [out of] the rib" - Rabbi Eliezer said in the name of Rabbi Yossi the son of Zimra: woman was endowed with more understanding than man. As it is taught: at eleven years and one day, her vows stick; at twelve years and one day her vows apply; and all twelve-year-olds are checked. But for males, at twelve years and one day his vows stick; at thirteen years they apply, and all thirteen-year-olds are checked.