No, scientifically speaking, humans are not "half male and half female." The notion of humans being "half male and half female" seems to be based on a misunderstanding of sexual reproduction and the concept of gender.
Biologically, humans have two distinct sexes: male and female. The determination of an individual's sex is primarily based on the presence of specific sex chromosomes. Typically, females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). The presence or absence of the Y chromosome is crucial in determining male development.
During sexual reproduction, an egg (which carries an X chromosome) from the mother combines with a sperm (which can carry either an X or Y chromosome) from the father. If the sperm carrying an X chromosome fertilizes the egg, the resulting combination (XX) leads to the development of a female offspring. If the sperm carrying a Y chromosome fertilizes the egg, the resulting combination (XY) leads to the development of a male offspring.
It's important to note that biological sex is not the same as gender. While sex is typically determined by physical and genetic characteristics, gender is a complex social construct that encompasses personal identity, societal roles, and cultural expectations. Gender identity is an individual's deeply felt sense of being male, female, or something else, and it may not necessarily align with an individual's biological sex.
In summary, humans are not "half male and half female" but rather have distinct biological sexes of male and female, determined by the combination of sex chromosomes. Gender identity, on the other hand, is a separate concept that goes beyond biological characteristics and encompasses a wide range of identities and expressions.