In the biology of gender, sex chromosomes or "gametes" comprise those set of genetics which determine the sex of the individual.
The two sex chromosomes are known as "X Chromosomes" and "Y Chromosomes" with the combinations being XX (an X from the mother and an X from the father) rendering a female individual while an XY (an X from the mother and a Y from the father) rendering a male.
There are situations where the combinations merge into a configuration known as "mosaic" where different combinations of gamete combine such that there is a combination of gender rendered in the individual. Indeed, “intersex” refers to a variety of conditions where individuals are born with a reproductive or sexual anatomy which is nonconformant to being totally "female" or "male".
These individuals were formerly rushed into surgery by ignorant and unethical medical professionals whose cookie cutter version of humanity did not conform to that wide spectrum we call "normal". These actions often occurred at the protest of the parents and the damage done to these people has been well documented over the years.
Today is Intersex Awareness Day, a day for those who are of mosaic genetic makeup to have their human rights recognized publically and those issues faced by intersex individuals brought to the fore.