Maternal age effect

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Graph showing increased risk of Down syndrome over time
Graph showing increased risk of Down syndrome over time

The maternal age effect describes the exponentially increasing risks for numerical chromosomal abnormalities among her gametes as a prospective mother ages. This increase reflects the overall increase in the rate of nondisjunction with maternal age.


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Physiology, endocrinology, sex: Reproductive physiology and endocrinology

Menstrual cycle/Estrous cycle: Menstruation - Follicular phase - Ovulation - Luteal phase

Gametogenesis: Spermatogenesis - Oogenesis

Human sexual behavior - Sexual intercourse - Erection - Ejaculation - Orgasm - Insemination - Fertilisation/Fertility - Pregnancy - Postpartum period

Prenatal development - Sexual dimorphism - Sexual differentiation - Puberty (Menarche, Adrenarche) - Maternal age/Paternal age - Climacteric (Menopause, Andropause)

Oviposition - Oviparity - Ovoviviparity - Viviparity


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