The twin-family design was used to assess social closeness between twin aunts/uncles and their respective nieces/nephews. Monozygotic (MZ) twins share 100% of their genes; therefore, MZ twins would be considered to be the genetic "parent" of their nieces/nephews. The present study is a ...
monozygotic (MZ) twins 单卵(同卵)孪生 dizygotic (DZ) twins 异卵双生
The families produced by MZ and DZ twins provide statistics which permit the detection and estimation of these effects. In particular, they provide statistics derived from various types of age-matched half-sibs and cousins in addition to those derived from the more usually studied full-sib or ...
The developmental origins of a disposition toward empathy: Genetic and environmental contributions. The authors investigated the of a disposition toward empathy and its genetic and environmental origins. Young twins' (N = 409 pairs) cognitive (hypothesis ... A Knafo,C Zahn-Waxler,C Van Hulle,.....
The most common type of study aimed at demonstrating the heritability of IQ involves comparing the two fundamentally different kinds of twins—monozygotic (MZ) or identical twins and dizygotic (DZ) or fraternal twins. The rarer MZs are the result of the fertilisation of a single ovum by a ...
An analysis of their responses was undertaken to determine whether MZ twins were more concordant than DZ in their preferences. By discussing simple and crossed concordances, there was 68·6% concordance for MZ twins and 57·5% for DZ twins (significant at P<0·01). This lends support to the...
Shared genes or shared placenta: What makes MZ twins more similar than DZ twins?constraintsdevelopment programmesemploymentplanningrural developmentABSTRACTdoi:10.1016/S0920-9964(00)90542-5J. van OsM. DanckaertsS. Van GestelC. DeromR. Vlietinck...
Data from individual interviews, blood grouping analyses, and ratings of photographs of a large sample of adolescent twins were examined in order to assess the accuracy of zygosity determination by alternate methods. Although the accuracy of the twins themselves and of the raters was above chance, ...
As part of a recent evaluation of Colorado birth records for the years 2006 through 2008 we became aware of a shifting trend in the proportion of MZ and DZ twins in the Colorado population. Historically (Bulmer 1970 The biology of twinning in man, Clarendon, Oxford) we have expected a 1/...
However, we do not observe differences between the mothers of naturally conceived DZ twins and the mothers of ART MZ twins in MoBa. We are currently adding analysis comparing the mothers of naturally conceived DZ with mothers who naturally or through ART conceived singletons. LIMITATIONS, REASONS ...