Answer: xchromosome

AnswerCrossword Clue
XCHROMOSOMEIt occurs in pairs in females
XCHROMOSOMESex determinant
XCHROMOSOMEGift from one's mother, and perhaps from one's father
XCHROMOSOMEGender determinant
XCHROMOSOMEGender factor
XCHROMOSOMEA man has to have one
XCHROMOSOMEAlmost every man in the world has one