Respuesta :
Answer:
"The combination of sex chromosomes received from parents " .
Explanation:
Sex determination : The process by which sex of a child is determined .
Parental generation :
Mother     Father
XX Â Â Â Â Â Â Â Â Â XY (sex chromosomes )
X,X Â Â Â Â Â Â Â Â Â X,Y Â (gametes )
First filial generation :
    X     Y
X Â Â XX Â Â Â XY
X Â Â XX Â Â Â XY
If XX is formed then it is girl and if XY is formed then it is boy .
Conclusion :
- we concluded that there is 50-50 percent chance of boy or a girl .
- Sex of a child is determined by father because father produce different gametes .