zygosity


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zygosity

 [zi-gos´ĭ-te]
the condition relating to conjugation, or to the zygote, such as (a) the state of a cell or individual in regard to the alleles determining a specific character, whether identical (homozygosity) or different (heterozygosity); or (b) in the case of twins, whether developing from one zygote (monozygotic twins) or two zygotes (dizygotic twins).

zy·gos·i·ty

(zī-gos'i-tē),
The nature of the zygotes from which individuals are derived; for example, whether by separation of the division of one zygote (monozygotic), in which case they will be genetically identical, or from two separate zygotes (dizygotic).

zygosity

(zī-gŏs′ĭ-tē)
n.
The genetic condition of a zygote, especially with respect to its being a homozygote or a heterozygote.

zy·gos·i·ty

(zī-gos'i-tē)
The nature of the zygotes from which twins are derived; e.g., whether by division of one zygote (monozygotic), in which case they will be genetically identical, or from two zygotes, in which case they will be genetically different.

zy·gos·i·ty

(zī-gos'i-tē)
Nature of the zygotes from which individuals are derived; e.g., whether by separation of the division of one zygote, in which case they will be genetically identical, or from two separate zygotes.
References in periodicals archive ?
In this study, we have used dPCR as a more accurate quantitative PCR method than conventional real-time PCR to define RHD zygosity. We found rare haplotypes in a relatively small cohort of samples and identified that for 3 samples (plus 1 weak D sample), their predefined and labeled presumed genotype was indeed incorrect.
The evaluated twins were interviewed after zygosity determinations using a questionnaire that was developed specifically for this study.
Sex and Special Needs Status, by Zygosity MZ DZ Characteristics (n = 8) (n = 22) n = Twin Pairs Males 3 8 Female 5 4 Opposite Sex -- 10 Same SPNs 4 -- Different SPNs 1 6 Only 1 SPN Twin 3 16
Data collection on multiple births--establishing twin registers and determining zygosity. Early Hum Dev 2006;82(6):357-363.
Schousboe et al., "Age- and sex-differences in the validity of questionnaire-based zygosity in twins," Twin Research, vol.
The effects of assisted reproduction on the trends and zygosity of multiple in England and Wales 1974-99.
DNA tests by the center can be used to analyze siblingship, establish cousin or grandparent relationships and determine twin zygosity.
A likely explanation is that since most clinic labs have either no method or only unreliable methods of identifying sickle hemoglobin and none of the methods described here can determine zygosity, patients are less aware of the condition and probably die before seeking medical attention.
The zygosity of the participating pairs was determined by the genotyping of ten highly polymorphic genetic markers.
Molecular determination of RhD zygosity. Am J Obstet Gynecol 2006;195:S172.
Of the twins included in the study, 9 were fraternal twins, 6 were identical twins, and 2 were of unknown zygosity. All of the twins were Caucasian, and 11 of the 18 sets were blond.
Zygosity. DNA was extracted from peripheral venous blood samples.