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Twin zygosity and placentation
Author(s) -
CORNEY G.,
ROBSON ELIZABETH B.,
STRONG S. J.
Publication year - 1968
Publication title -
annals of human genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.537
H-Index - 77
eISSN - 1469-1809
pISSN - 0003-4800
DOI - 10.1111/j.1469-1809.1968.tb00052.x
Subject(s) - zygosity , placentation , dizygotic twins , biology , genetics , abo blood group system , placenta , obstetrics , pregnancy , fetus , medicine
Summary The relationship between placentation and zygosity is discussed in an unselected series of 326 twin births. Zygosity determinations were based on sex, red‐cell antigens ABO, MNSs, Rh, Lu a , K and F a , the red‐cell enzymes Ac. P., 6‐PGD, PGM 1 and AK and placental alkaline phosphatase. The results indicate that, whereas dizygotic twins are always dichorionic, between 15% and 20% of monozygotic twins may also be dichorionic. Tables are given which allow information on the enzyme phenotypes to be utilized in estimating the probability of dizygosity in the case of twin pairs alike for all characters tested, where the types of the parents are unknown.