9 Q5 m7 e" o4 w5 D6 gXY(man) x XX(woman) = ! O$ b, R0 ^: Q2 F
XX or XY, XX or XX, XY or XY. Some people have a twin. 6 p2 D1 P$ g& c A, V1 ~% X, m* _1 [3 F8 L8 E! v" b
If 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.- p/ U; T) i9 O& ^: @
% |6 D' e) G) L# n$ `Becareful, eating drug may cause mutation although the possibility is not so high.