Determining if same-sex twins are identical or non-identical (from one egg or two; monozygotic or dizygotic) is not always straight forward, say the researchers. They looked at data from the Gemini study, a birth cohort of 2402 families with twins born in England and Wales in 2007.
Parents of same sex twins (1586) were asked if they knew whether their twins were identical or not and how they discovered that information.
The majority of parents (1302/82%) reported that they had been given the information by health professionals based on the formation of the placenta as seen on the prenatal scan. Of this group, as part of the Gemini data collection, all parents completed a validated zygosity questionnaire[i] when their twins were on average 8.2 months old. This questionnaire asks about the children's height, eye colour, hair colour and overall confusability and has been found in a previous study to correctly assign zygosity in 95% of cases.
The researchers found that out of the 1302 parents, 191 (14.7%) were misinformed about their same sex twins' zygosity (identical or non-identical).
In addition, 38% of parents said they were told after an antenatal scan that their twins shared a placenta and were therefore identical while 62% of parents were told their twins were non identical as they had two placentas.
However 25-30% of identical twins can have two placentas say the researchers. If the zygote splits within two days of fertilisation, separate placentas develop.
Jane Wardle, Health Behaviour Research Centre, Department of Epidemiology and Public Health, University College London and co-author of the commentary paper said:
"Finding out if your twins are identical or not is important to parents. However our data suggests that there may be a lack of knowledge among some health professionals about both identical and non identical twins having two placentas.
"Parents have the right to the relevant information if it is available. However most parents will understand that it is not always possible to give a specific answer."
John Thorp, BJOG Deputy-Editor-in-Chief added:
"This paper highlights the uncertainty that can exist in finding out whether same sex twins are identical or not. Additional training may be required for health professionals to avoid giving out the wrong information to parents."
1] Price TS, Freeman B, Craig I, Petrill SA, Ebersole L, Plomin R. Infant zygosity can be assigned by parental report questionnaire data. Twin Res 2000;3:129-133.
Antarctic Ice Sheet mass loss has increased
14.06.2018 | Technische Universität Dresden
WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
Light detection and control lies at the heart of many modern device applications, such as smartphone cameras. Using graphene as a light-sensitive material for...
Water molecules exist in two different forms with almost identical physical properties. For the first time, researchers have succeeded in separating the two forms to show that they can exhibit different chemical reactivities. These results were reported by researchers from the University of Basel and their colleagues in Hamburg in the scientific journal Nature Communications.
From a chemical perspective, water is a molecule in which a single oxygen atom is linked to two hydrogen atoms. It is less well known that water exists in two...
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
18.06.2018 | Earth Sciences
18.06.2018 | Process Engineering
18.06.2018 | Life Sciences