Zygote

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A zygote is formed when two gametes unite - usually a mother's egg and a father's sperm, through sexual reproduction[1].

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

References

  1. http://en.wikipedia.org/wiki/Sexual_reproduction
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