Twinning and Twins
نویسندگان
چکیده
منابع مشابه
Familial twinning and fertility in Dutch mothers of twins.
We studied twinning and fertility indices in mothers with spontaneous monozygotic (MZ) and dizygotic (DZ) twins and in mothers who conceived their twins after the use of assisted reproduction techniques (ART). Participants in this study consisted of 8,222 and 5,505 women with spontaneous DZ and MZ offspring and 4,164 and 250 women with ART DZ and MZ twin pairs, respectively. Women were compared...
متن کاملTwinning rates and survival of twins in rural Nepal.
BACKGROUND Twin pregnancies are common but there are few data on rates of twinning or survival of liveborn twin infants in developing countries. METHODS The rates of multiple births were calculated in a population-based cohort of married women of childbearing age who were enrolled in a randomized community trial to assess the impact of vitamin A or beta-carotene on maternal and infant health ...
متن کاملA genome wide linkage scan for dizygotic twinning in 525 families of mothers of dizygotic twins.
BACKGROUND The tendency to conceive dizygotic (DZ) twins is a complex trait influenced by genetic and environmental factors. To search for new candidate loci for twinning, we conducted a genome-wide linkage scan in 525 families using microsatellite and single nucleotide polymorphism marker panels. METHODS AND RESULTS Non-parametric linkage analyses, including 523 families containing a total o...
متن کاملGenetic modelling of dizygotic twinning in pedigrees of spontaneous dizygotic twins.
The inheritance of spontaneous dizygotic (DZ) twinning was investigated in 1,422 three-generation pedigrees ascertained through mothers of spontaneous DZ proband twins. DZ twinning was modelled as a trait expressed only in women. The penetrance was modelled first as a parity independent and secondly as parity dependent. The observed frequencies of maternal and paternal grandmothers with DZ twin...
متن کاملTwinning and Nonlinear Optics
A comprehensive theory of quasi-phase-matched (QPM) three-wave interactions in twinned plates of q3m semiconductors is developed. The 180* phase change required by QPM is studied by treating the nonlinear polarization as a bilinear form in the applied electric field and decomposing it into invariant and sign changing parts under a 2-fold rotation of an arbitrary crystal lattice. A new 3 X 3 mat...
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ژورنال
عنوان ژورنال: Journal of Medical Genetics
سال: 1989
ISSN: 1468-6244
DOI: 10.1136/jmg.26.12.800