Most cases of trisomy result from aging of an egg in the oviduct as it awaits fertilization. Suppose you could examine spontaneously aborted fetuses…

Most cases of trisomy result from aging of an egg in the oviduct as it awaits fertilization. Suppose you could examine spontaneously aborted fetuses for evidence of trisomies. What supporting evidence could you obtain to confirm what stage of meiosis mistakes occur?  

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