plastic surgery surgery concerned with the restoration, reconstruction, correction, or improvement in the shape and appearance of body structures that are defective, damaged, or misshapen by injury, disease, or anomalous growth and development. This kind of surgery has been practiced for thousands of years.
The sex chromosome of females contains two X's while that for males contains one Y and one X. The presence of this last chromosome pair determines the gender of a baby. Apart from the X and Y difference, these chromosomes have many other differences which form the characteristics of the two genders.
The sex-determining chromosome is carried by the sperm, the egg has no role in affecting the gender of the resulting embryo. Therefore, you could think of the sperm as being either male or female, so the sperm is either a boy or girl from the moment it is formed in your testes.