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A zygote is formed when two [[Gametes|gametes]] unite -&nbsp;usually a mother's egg and a father's [[Sperm|sperm]], through [[Sexual reproduction|sexual reproduction]]<ref>http://en.wikipedia.org/wiki/Sexual_reproduction</ref>. 

In humans, each parental unit donates 23 [[Chromosome|chromosomes]] in their [[Haploid gametes|haploid gametes]] which combine to give the zygote (future offspring) 46 chromosomes (except in cases of non-disjunction) and create a [[Diploid cell|diploid cell]] that is genetically unique from the parent cells. 

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