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| [Mitotic non-Disjunction] | when a chromosome pair fails to separate correctly during cell division, resulting in daughter cells which have missing or extra chromosomes.
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| [Mitosis] | the usually process of cell division involved in growth and development; asingle cell produces two daughter cells which are identical to on another, and to the original parent cell.
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| [Miscarriage] | loss of a pregnancy prior to 20 weeks. most miscarriages occur in the first trimester, prior to 12 weeks of pregnancy.
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| [Meiotic origin] | originating during the development of the sperm or egg
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| [Meiotic non-disjunction] | when a chromosome pair fails to separate correctly during meiosis, resulting in reproductive cells which have missing or extra chromosomes.
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| [Meiosis] | a specialkind of cell division which produces the reproductive cells, the egg and sperm, whereby the chromosome content is reduced to 23 chromosomes (the haploid number).
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| [Maternal UPD] | when both members of a chromosome pair are inherited from the mother, instead of one from each parent. |
| [Maternal serum screen] | a screening test which provides a calculated risk of fetal abnormalities such as neural tube defects and down syndrome for a woman in her pregnancy. the calculation is based on the levels of three analytes in the mother¡¯s blood during pregnancy, alpha-fetoprotein, estriol, human chorionic gonadotropin, and other factors that are unique to her. also called the triple screen.
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| [Maternal] | something that originates from the mother
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| [Marker chromosome] | a part of a chromosome, usually small, of unknown origin.
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