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Eukaryotic cells reproduce sexually, involving the fusion of two gametes. Each gamete contains one set of chromosomes and is called haploid where as the zygote formed when two gametes combine is known as a zygote and is diploid (contains 2 sets of chromosomes). Today's gene pool consists of genes that have been passed down many generations from common ancestors. The species is an evolving unit sharing a common gene pool.

The sexual process and reproduction are opposite processes. In sex one cell divides to create two cells where as in reproduction two cells fuse and form one. In some species, reproduction can occur without sex and this production of eggs that can develop without being fertilized is known as parthenogenesis. Although this process is common for plants and some reptiles and insects, it has not been observed in mammals. Reproduction without sex is not possible.

Sex is advantageous to populations . Selective advantages can occur at three levels. Firstly, entire......

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Approximate Word Count: 880
Approximate Pages: 4 (250 words per double-spaced page)

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