tetragametic individual

genetics

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In chimera
… fuse together, producing a so-called tetragametic individual—an individual originating from four gametes, or sex cells. (Under normal circumstances, in the absence of zygote fusion, two fertilized eggs result in the production of dizygotic, or fraternal, twins.) Dispermic chimerism can also occur when a zygote fuses with a fertilized polar body…
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