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Zygosity
I am curious.....
Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. What has peaked my interest is the Harvard study that I mentioned earlier has offered to do a DNA test as compensation for participating. So, it has me thinking about the girls zygosity again. ~Kimberly Mommy to Alexis Iliana 07/17/99 and Emma Elidia & Aislyn Gabriela 10/01/02 come see us... http://www.babiesonline.com/babies/a/aislynemma/ |
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Zygosity
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#3
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Zygosity
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#4
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Zygosity
"H Schinske" wrote in message ... wrote: Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. I don't know about the stats here, but I have read in several places that 1/4 to 1/3 (the exact numbers vary, but in general a substantial fraction) of identical twins have separate placentas/chorions. Its been a while but I thought the figure was 50% of identical twins are dichorionic. The rest are almost all monochorionic/diamnionic except for a very small percentage that are mono/mono of which many do not make it. My former baby sitter lost a set of mono/mono twin boys in their eighth month... beyond sad. -- sharon, momma to savannah and willow (11/11/94) |
#5
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Zygosity
"H Schinske" wrote in message ... wrote: Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. I don't know about the stats here, but I have read in several places that 1/4 to 1/3 (the exact numbers vary, but in general a substantial fraction) of identical twins have separate placentas/chorions. Its been a while but I thought the figure was 50% of identical twins are dichorionic. The rest are almost all monochorionic/diamnionic except for a very small percentage that are mono/mono of which many do not make it. My former baby sitter lost a set of mono/mono twin boys in their eighth month... beyond sad. -- sharon, momma to savannah and willow (11/11/94) |
#6
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Zygosity
My girls each had their own placentas. They also had their own sacks.
Morgan's water broke but Megan's had to be broken. We had their DNA tested when they were 2.5 years old. They are 99.9% alike in DNA. -- Erin Morgan and Megan 2/15/97 Evan 5/14/00 "KimandJuan" wrote in message ... I am curious..... Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. What has peaked my interest is the Harvard study that I mentioned earlier has offered to do a DNA test as compensation for participating. So, it has me thinking about the girls zygosity again. ~Kimberly Mommy to Alexis Iliana 07/17/99 and Emma Elidia & Aislyn Gabriela 10/01/02 come see us... http://www.babiesonline.com/babies/a/aislynemma/ |
#7
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Zygosity
My girls each had their own placentas. They also had their own sacks.
Morgan's water broke but Megan's had to be broken. We had their DNA tested when they were 2.5 years old. They are 99.9% alike in DNA. -- Erin Morgan and Megan 2/15/97 Evan 5/14/00 "KimandJuan" wrote in message ... I am curious..... Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. What has peaked my interest is the Harvard study that I mentioned earlier has offered to do a DNA test as compensation for participating. So, it has me thinking about the girls zygosity again. ~Kimberly Mommy to Alexis Iliana 07/17/99 and Emma Elidia & Aislyn Gabriela 10/01/02 come see us... http://www.babiesonline.com/babies/a/aislynemma/ |
#8
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Zygosity
Um ... at risk of showing my ignorance here ("btw, are your bg twins
identical?") ... is 99.9 "identical"? And if so, is 98.6 identical, too? And if so, where the heck is the cut-off? --Janet Elliot, Hanna, Connor (10/21/96) and Holly (4/4/01) "Kender" wrote in message news:iaYsb.197369$Fm2.182546@attbi_s04... My girls each had their own placentas. They also had their own sacks. Morgan's water broke but Megan's had to be broken. We had their DNA tested when they were 2.5 years old. They are 99.9% alike in DNA. -- Erin Morgan and Megan 2/15/97 Evan 5/14/00 "KimandJuan" wrote in message ... I am curious..... Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. What has peaked my interest is the Harvard study that I mentioned earlier has offered to do a DNA test as compensation for participating. So, it has me thinking about the girls zygosity again. ~Kimberly Mommy to Alexis Iliana 07/17/99 and Emma Elidia & Aislyn Gabriela 10/01/02 come see us... http://www.babiesonline.com/babies/a/aislynemma/ |
#9
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Zygosity
Um ... at risk of showing my ignorance here ("btw, are your bg twins
identical?") ... is 99.9 "identical"? And if so, is 98.6 identical, too? And if so, where the heck is the cut-off? --Janet Elliot, Hanna, Connor (10/21/96) and Holly (4/4/01) "Kender" wrote in message news:iaYsb.197369$Fm2.182546@attbi_s04... My girls each had their own placentas. They also had their own sacks. Morgan's water broke but Megan's had to be broken. We had their DNA tested when they were 2.5 years old. They are 99.9% alike in DNA. -- Erin Morgan and Megan 2/15/97 Evan 5/14/00 "KimandJuan" wrote in message ... I am curious..... Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. What has peaked my interest is the Harvard study that I mentioned earlier has offered to do a DNA test as compensation for participating. So, it has me thinking about the girls zygosity again. ~Kimberly Mommy to Alexis Iliana 07/17/99 and Emma Elidia & Aislyn Gabriela 10/01/02 come see us... http://www.babiesonline.com/babies/a/aislynemma/ |
#10
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Zygosity
Janet,
My twins are both girls . . . Morgan is a girl. I don't know if you were referring to them as bg twins. When they do a DNA test they test 6-8 different DNA strands where differences are common to most individuals. The informational sheet I got from the lab says: "Usually there are millions of differences in the DNA 'spelling' of one person's genes compared to another person's genes. The only exception is in the case of monozygotic (identical) twins who have the same spelling for all 3 billion letters (with rare exceptions). Even siblings or close relatives have hundreds of thousands of differences in their DNA code." It goes on to say if the areas they test match up for at least six or more sites then the twins are monozygotic with a greater then 99% probability. Therefore, I think this % is referring to the test accuracy (?). It also says if they are different for two or markers then the twins are dizygotic (fraternal). They tested my girls on 8 DNA markers and all eight were a match so the probability that they are identical has a greater then 99% probability the report states. -- Erin Morgan and Megan 2/15/97 Evan 5/14/00 "multimom4" wrote in message news:lg7ub.173192$9E1.893856@attbi_s52... Um ... at risk of showing my ignorance here ("btw, are your bg twins identical?") ... is 99.9 "identical"? And if so, is 98.6 identical, too? And if so, where the heck is the cut-off? --Janet Elliot, Hanna, Connor (10/21/96) and Holly (4/4/01) "Kender" wrote in message news:iaYsb.197369$Fm2.182546@attbi_s04... My girls each had their own placentas. They also had their own sacks. Morgan's water broke but Megan's had to be broken. We had their DNA tested when they were 2.5 years old. They are 99.9% alike in DNA. -- Erin Morgan and Megan 2/15/97 Evan 5/14/00 "KimandJuan" wrote in message ... I am curious..... Are there any same sex twins that were "bi-chorial" with two separate placentas and "BI-amniotic" with two separate amniotic sacs, and later DNA tested later and proved to be identical in this news group. I wonder how common it is. What has peaked my interest is the Harvard study that I mentioned earlier has offered to do a DNA test as compensation for participating. So, it has me thinking about the girls zygosity again. ~Kimberly Mommy to Alexis Iliana 07/17/99 and Emma Elidia & Aislyn Gabriela 10/01/02 come see us... http://www.babiesonline.com/babies/a/aislynemma/ |
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