Sex is the trait that determines whether a sexually reproducing animal or plant produces male gametes or female ones. Male plants and animals produce smaller gametes (spermatozoa, sperm) while females produce larger ones (ova, often called egg cells). Organisms that produce both types of gametes are called hermaphrodites. During sexual reproduction, male and female gametes fuse to form zygotes, which develop into offspring that inherit traits from each parent.
Males and females of a species may have physical similarities (sexual monomorphism) or differences (sexual dimorphism) that reflect various reproductive pressures on the respective sexes. Mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.
The terms male and female typically do not apply in sexually undifferentiated species in which the individuals are isomorphic (look the same) and the gametes are isogamous (indistinguishable in size and shape), such as the green alga Ulva lactuca. Some kinds of functional differences between gametes, such as in fungi, may be referred to as mating types.
A living thing's sex is determined by its genes. Most mammals have the XY sex-determination system, where male mammals carry an X and a Y chromosome (XY), whereas female mammals carry two X chromosomes (XX). Other chromosomal sex-determination systems in animals include the ZW system in birds, and the X0 system in insects. Various environmental systems include temperature-dependent sex determination in reptiles and crustaceans.
Sex Education :
Sex education, also known as sexual education or sex ed, is the instruction of issues relating to human sexuality, including emotional relations and responsibilities, human sexual anatomy, sexual activity, sexual reproduction, age of consent, reproductive health, reproductive rights, sexual health, safe sex and birth control. Sex education which includes all of these issues is known as comprehensive sex education, and is often opposed to abstinence-only sex education, which only focuses on sexual abstinence. Sex education may be provided by parents or caregivers or as part at school programs and public health campaigns. In some countries it is known as Relationships and Sexual health education.
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