parshanut torah comment - Adam masculine and feminine?

I've gotten the advice to ask this question apart from another question i asked (Elohim plural singular): so here it is

Bereshit 5:1 reads according to my own words: 'In/On the day that Elohim created the human being (Adam), in the Demut of Elohim He made him (the human being), male (masculine) and female (feminine) He created them (the male and female) and He blessed them, and called their (the male and female human beings) name Human (Adam)'.

Bereshit 1:27 also reads: 'And Elohim created the human being (Adam) in His Tzelem, Elohim created him (the human) male (masculine) and female (feminine) He created them'.

Question: How could one human being be made made male and female or masculine and feminine, and how does that image fit to the Tzelem and Demut of Elohim?