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This mode of reproduction is called asexual, and it is still used by many species, particularly unicellular, but it is also very common in multicellular organisms.

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Sexual reproduction in eukaryotes is a process whereby organisms form offspring that combine genetic traits from both parents.

Chromosomes are passed on from one generation to the next in this process.

In addition to animals, plants, and fungi, other eukaryotes (e.g.

the malaria parasite) also engage in sexual reproduction.

Other animals have sex-determination systems as well, such as the ZW sex-determination system in birds, the X0 sex-determination system in insects, and various environmental sex determination systems .

One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.

Many species, particularly animals, have sexual specialization, and their populations are divided into male and female individuals.

Conversely, there are also species in which there is no sexual specialization, and the same individuals both contain masculine and feminine reproductive organs, and they are called hermaphrodites. The reason for the evolution of sex, and the reason(s) it has survived to the present, are still matters of debate.

As sexual reproduction developed by way of a long process of evolution, intermediates exist.

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