The half-DNA of eggs is selected as they divide from ancestor cells. Eggs of a woman (baby/fetus) develop while in mother's womb, but they are more immediately

The half-DNA of eggs is selected as they divide from ancestor cells. Eggs of a woman (baby/fetus) develop while in mother's womb, but they are more immediately inside the fetus, are formed from the cells of the fetus and are descendants of the same single cell zygote as (most) of the cells that form the woman's body.