This is the genetics: 1 W: g. o( a( ]4 o& ~% ]" P# ~' l8 p& [
XY(man) x XX(woman) = 9 K! ^, M$ |. [' `* J) L
XX or XY, XX or XX, XY or XY. Some people have a twin. $ ]& M7 i) \. v
: I" @4 P1 I6 S8 s' xIf you really need a boy, you can ask a doctor to take your Y only and injiect into your wife's XX, then you will have boy only.6 ?) ]8 ~, i1 K& _. O3 a
: X. }) S' ]& j" g! i- |8 i% L- ZBecareful, eating drug may cause mutation although the possibility is not so high.