During the early stages of reproduction, a sperm fertilizing an egg. What is formed when these two are joined is a zygote. |
Examples of Zygote:
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https://old.library.georgetown.edu/newjour/z/msg02159.html https://zygote.swarthmore.edu/ https://en.wikipedia.org/wiki/Zygote https://simple.wikipedia.org/wiki/Zygote |
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A scenario for speciation via polyploidy: A diploid cell undergoes failed (nondisjunctive) meiosis to produce diploid gametes, which self-fertilize to produce a tetraploid zygote. |