Answer: xchromosome

AnswerCrossword Clue
XCHROMOSOME

It occurs in pairs in females

XCHROMOSOME

Sex determinant

XCHROMOSOME

Gift from one's mother, and perhaps from one's father

XCHROMOSOME
Gender determinant
XCHROMOSOME
Gender factor
XCHROMOSOMEA man has to have one
XCHROMOSOMEAlmost every man in the world has one