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For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.
Among humans and other mammals, males typically carry XY chromosomes, whereas females typically carry XX chromosomes, which are a part of the XY sex-determination system.
Chromosomes are passed on from one generation to the next in this process.
Sex comprises the arrangements that enable sexual reproduction, and has evolved alongside the reproduction system, starting with similar gametes (isogamy) and progressing to systems that have different gamete types, such as those involving a large female gamete (ovum) and a small male gamete (sperm).
Bacteria, for instance, reproduce asexually, but undergo a process by which a part of the genetic material of an individual donor is transferred to another recipient.
Disregarding intermediates, the basic distinction between asexual and sexual reproduction is the way in which the genetic material is processed.
Initially the reproduction was a replicating process that consists in producing new individuals that contain the same genetic information as the original or parent individual.
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, including many of those with sexual reproduction.
One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process.