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For instance, mate choice and sexual selection can accelerate the evolution of physical differences between the sexes.
One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of 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).
In complex organisms, the sex organs are the parts that are involved in the production and exchange of gametes in sexual reproduction.
the origin of chromosomal sex determination may have been fairly early in eukaryotes (see Evolution of anisogamy).
Diploid organisms can, in turn, form haploid cells (gametes) that randomly contain one of each of the chromosome pairs, via meiosis.Each cell in the offspring has half the chromosomes of the mother and half of the father.Genetic traits are contained within the deoxyribonucleic acid (DNA) of chromosomes—by combining one of each type of chromosomes from each parent, an organism is formed containing a doubled set of chromosomes.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.