On the body of organisms there are two types of chromosomes called autosome and sex chromosome. Autosome decide characters of body and sex chromosome decide sex of new baby. In case of human body there are 23 pairs of chromosome among which 22 pairs are autosome and 1 pair are sex chromosome. Sex chromosome slightly differ in male and female. In case of male there are 22 pair of autosome and one pair sex chromosome named X and Y. in case of female autosome is same but sex chromosome are named X and X. So, in both cases female can give only X chromosome to new baby but male can fertilize egg with either X or Y chromosome. Thus probability of birth of new baby always becomes 50% as shown in fig below.
The sex determination system specially on mammals
In other cases, sex of a fetus is determined by environmental variables (such as temperature in some reptiles). The details of some sex-determination systems are not yet fully understood. Hopes for future fetal biological system analysis include complete-reproduction-system initialized signals that can be measured during pregnancies to more accurately determine whether a determined sex of a fetus is male, or female. Such analysis of biological systems could also signal whether the fetus is hermaphrodite, which includes total or partial of both male and female reproduction organs.
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