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When do females form all their ova (eggs)? At what stage of Meiosis I are they...

When do females form all their ova (eggs)? At what stage of Meiosis I are they halted? Can the [ife style choices of a person’s grandmother potentially impact the genetics of her grandchildren?

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The female oogenesis begins at the embryonic stage and the cell is called the oogonium.The oogonium will be diploid and it undergoes mitosis to form the primary oocyte.The primary oocyte begins to undergo the meiotic division and enters the meiosis 1 but gets arrested in the diplotene stage of prophase 1 atage before the birth.The process is resumed only in the adolescent age.

Yes .The lifestyle choices of the grandmother can affect the grandchildren.This is because the gamates get arrested in their prophase 1 state and this is the stage in which the recombination and variations are transffered and thus the lifestyle during the early stages of life can affect the genetics.

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