Further, as our participants indicated themselves as MZ, DZ, or NT sibling, we used a very limited measurement
of zygosity (Song et al., 2010).
Read on to discover the definition
of zygosity.
But twin type is actually a classification
of zygosity and defined by how twins form, not by what they look like.
The number of placentas can be an indicator
of the zygosity of the twins, a term that refers to whether they developed from the same egg or from different eggs.
Not exact matches
But a study found that nearly 15 percent
of parents were misinformed about the
zygosity of their baby twins.
Even parents
of twins and twins themselves are frequently confused about
zygosity, and how it is used to categorize twins.
Zygosity may have implications in a twin or multiple pregnancy, for example, in cases
of medical complications such as Twin - to - Twin Transfusion Syndrome (TTTS).
Zygosity is a fancy way
of noting whether your twins (or other multiples) are identical (monozygotic) or fraternal (dizygotic).
The numbers become even more confused because there are different types
of twins, and the rates are different based on
zygosity.
Sex - and
zygosity - specific mean values
of handgrip strength, height, weight, body mass index, and waist circumference were highly comparable between fraternal twins
of opposite sex and fraternal twins
of same sex.
Zygosity analyses
of MCT indicated four separate patterns, suggesting that MCT can arise from errors at various stages
of oogenesis.
Using logistic regression controlling for
zygosity, sex, age at interview, interview form, and correlations within families, the level
of standardized neuroticism strongly predicted risk
of phobia (OR, 1.67; 95 % CI, 1.58 - 1.77; z = 18.55; P <.001).