Page 1 of 1: O & G- The easiest method for determining zygosity

decembermist · Credits: 41081 My Scrapbook

a) sex of the foetuses
b) placental examination
c) skin grafting
d) blood grouping

bhavu · Credits: 9481 My Scrapbook

it should be b

draditithegreat · Credits: 1247960 My Scrapbook

yup!

guest · Credits: 78425 My Scrapbook My Reading List 262569 Books

skin grafting?? Approximately 30% of monozygotic twins have dichorionic/diamniotic placentas!!

bhavu · Credits: 9481 My Scrapbook

chand they have not asked how accurate the investigation is or what is the sensitivity or specificity of the investigation is. here the easiest method is askedis asked and it is certianly placental examination by usg.

bhavu · Credits: 9481 My Scrapbook

doppler usg is used in twins for
1) to diagnose twin
2)twin to twin transfusion
3) conjoint twins

use of usg in twin preganancy
10th week two gestational sac
14th week two heads, bpd measurements
16-24 week placentation

decembermist · Credits: 41081 My Scrapbook

I agree with bhavu

dr_nidhi · Credits: 12996 My Scrapbook My Reading List 5 Books

agreed!

King75 · Credits: 3054 My Scrapbook

I agree. Just to support the rest of the team.

ZYGOSITY -The terms identical and fraternal are common words that refer to zygosity -- the characteristics of the cell union that happened at conception.

Identical -- monozygotic (one zygote) -- twins form when a single fertilized egg splits into two genetically identical parts. The twins share the same DNA set, thus they may share many similar attributes. However, since physical appearance is influenced by environmental factors and not just genetics, identical twins can actually look very different. Identical twins are always same-sex sets.

Fraternal -- or dizygotic (two zygotes) -- twins develop when two separate eggs are fertilized and implant in the uterus. The genetic connection is no more or less the same as siblings born at separate times. They may look alike, or they may not.

Scientists have theorized a third, hybrid type called polar body twinning, that occurs when an unfertilized egg splits into two parts and each part is fertilized by a different sperm. The twins would then share one-half of their gene set (from their mother). Because it is the father's DNA that determines the sex, the twins can be either same-sex or male/female.

So if appearance isn't a reliable guide in determining twin type, how can parents confirm their twins' zygosity? In some cases, it will be evident during pregnancy. Some identical twins form in a single sac, sharing a placenta and amniotic membranes. However, the number of placentas isn't always a clear indicator either. Two placentas of fraternal twins can fuse together and appear to be one. And identical twins may develop with completely separate placentas and sacs.

The only way to know for sure is through genetic testing. A sample of DNA is taken from each child (usually through a painless swab on the inside of the cheek) and compared for similarities.

The choice over here is nmber of placenta like u guys said.

Thank u

nazia_k · Credits: 2890 My Scrapbook

i'll go for sex of fetuses
as if sex is different then dizygous fetuses

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