Gametes (egg/sperm) cannot be used to create a sex binary in humans, because no gametes can be present along with ambiguous gonadal tissue.
This third “undefined” possibility eliminates the possibility for a binary sex classification in humans.
Gametes are only one of multiple sex markers that in aggregate constitute a person’s sex as female, male, or a blend of both (intersex/undefined).
Other critical sex markers beyond gametes include but are not limited to gonads, genitals, chromosomes, sex hormones, and secondary characteristics.
No sex marker, including gametes, present as a sex binary.
On *average*, females *tend* to have XX chromosomes and males *tend* to have XY chromosomes.
But those are not the only options, the situation is absolutely not a binary male or female.
In humans, the following sex chromosome variations are naturally occurring:
45, X, also called Turner syndrome
45,X/46, also called XY mosaicism
46, XX/XY
47, XXX, also called Trisomy X
47, XXY, also called Klinefelter syndrome
47, XYY with normal phenotype
48, XXXX
48, XXXY
48, XXYY
49, XXXXY
49, XXXXX
XX Male Syndrome
XX Gonadal Dysgenesis
XY Gonadal Dysgenesis
Are you talking about Disorders of Sexual Development (DSDs).
