For those that are doing radar hacks and want to use them for NobleGarden, you can find both sex and race inside UNIT_FIELD_BYTES_0.
The first byte (offset 0x40 from the start of the mob structure) is the race, and the third one (0x42) is the sex.
For race:
0x1 - Human
0x2 - Orc
0x3 - Dwarf
0x4 - Night Elf
0x5 - Undead
0x6 - Tauren
0x7 - Gnome
0x8 - Troll
0xa - Blood Elf
0xb - Draenei
for sex:
0 - Male
1 - Female