There are a ton of influences that determine which parts of us are masculine and which parts are feminine. Genetics is an obvious one, but it is not the only one, and it is by no means as definitive as many people believe. There are also hormonal influences, some of which originate in the genetic material and some of which are influenced by environmental factors. These factors affect different parts of the body differently, so there are many possible combinations of masculine/feminine characteristics possible in one person.
The obvious combination that is relevant to us is a masculine brain and female genitals, or vice versa, which is pretty much the definition of being trans. But even that is complicated because there are about half a dozen different areas of the brain that show gender dimorphism, so some parts of the brain can be masculine and other parts feminine.
Then there are various intersex variations of the genitals and reproductive organs, in numerous combinations.
And the various secondary sex characteristics like facial hair, body hair, pubic hair, alopecia, bone structure, etc., can occur in multiple gender combinations.
So we are all a mosaic of masculine and feminine characteristics. It is actually pretty amazing that some people think there are only two genders!