The biological characteristics of being female or male refer to sex, which is determined by physical and genetic traits. These include,Chromosomes - Typically XX for females and XY for males.Reproductive organs - Females usually have ovaries and a uterus; males typically have testes and a penis.Secondary sex characteristics - Such as breast development in females and facial hair in males, usually appearing during puberty.These traits are part of a person's biological sex, which is different from gender, a social and cultural concept.