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Autumn Whisper 1 child; Utah 9977 posts
27th Feb '13
Quoting lamr - 02-08-13-21:" <blockquote><b>Quoting speaktruth2powr:</b>" Technically, if identical twins marry ... [snip!] ... the term IDENTICAL."</blockquote> They wouldn't be siblings, they'd be cousins. They don't have the same mom and dad."


Of course they would technically be cousins.

But genetically, it would be as though they were siblings, because they came from the same gene pool.

regina_margot 2 kids; New York, New York 1543 posts
27th Feb '13
Quoting speaktruth2powr:" Genetically they would be siblings."

that's right. they would look exactly as close as any siblings on a DNA test.

Phf- ee bee;) Due January 26 (girl); 18 kids; Pennsylvania 5310 posts
27th Feb '13
Quoting Lizplustwo:" What OP is saying is that if a set of identical twins reproduces with another set of identical twins, ... [snip!] ... of identical twins, will their children be identical to the other couple's (because their parents are genetically identical)."

exactly.

Good Queen Bess 2 kids; Ontario 46834 posts
27th Feb '13
Quoting forgive-n let*love:" They'd be cousins, each twin married another twin.... yes, their DNA would be super close- but not identical. **Im not saying they will have twins themselves**"


Untrue.



Identical twins have identical DNA

Tricia♥ [+4Boys] 4 kids; Indiana 5818 posts
27th Feb '13
Quoting speaktruth2powr:" Technically, if identical twins reproduce with another set of identical twins ....their children will ... [snip!] ... ....their children will biologically be siblings. Identical twins are always the same gender....hence the term IDENTICAL."



:!: This. Their children, technically cousins, would genetically be siblings.



I have identical twin boys, btw.

ChubbyCheekers 2 kids; New York 3117 posts
27th Feb '13

I'm with you. Like I said, genetics is more complicated than that...you carry multiple genes for different traits, even though you may not express them. The simplest example I can think of is that you can carry the gene for blue eyes even if you have brown eyes. Each egg and sperm has a unique combination of genes. So the children would be more genetically similar than most cousins, yes, but not identical.

one of each 4 me Due January 8; TTC since Mar 2014; 3 kids; Ohio 6216 posts
27th Feb '13

while they would have close DNA b/c of the similarities they would be no different than siblings in any other family (even though they are cousins). you would have to take their dna and make the little squares and see the different combinations and each kid would have a 1 in 4 chance of being from the same square. if that makes sense.

lamr - 02-08-13-21 2 kids; Crazytown, ON, Canada 6008 posts
27th Feb '13

<blockquote><b>Quoting speaktruth2powr:</b>" Untrue. Identical twins have identical DNA"</blockquote>




She's talking about the kids not being identical. If each set had a girl, they wouldn't be the exact same looking.



OP, like you said, siblings are created from the same mom and dad and don't look identical.

ChubbyCheekers 2 kids; New York 3117 posts
27th Feb '13
Quoting lamr - 02-08-13-21:" <blockquote><b>Quoting speaktruth2powr:</b>" Untrue. Identical twins have identical ... [snip!] ... be the exact same looking. OP, like you said, siblings are created from the same mom and dad and don't look identical."

:!:



True. If your example was true, then it would mean that the same parents would always produce genetically identical offspring.

Autumn Whisper 1 child; Utah 9977 posts
27th Feb '13
Quoting one of each 4 me:" while they would have close DNA b/c of the similarities they would be no different than siblings in any ... [snip!] ... and see the different combinations and each kid would have a 1 in 4 chance of being from the same square. if that makes sense."


And that punnet square would be for each individual gene...assuming it is a simple dominant/recessive.

Phf- ee bee;) Due January 26 (girl); 18 kids; Pennsylvania 5310 posts
27th Feb '13
Quoting speaktruth2powr:" Untrue. Identical twins have identical DNA"


Yes, i know that.. BUT if they reproduce, each child will NOT have the same DNA as their cousin/genetic siblings...... say they each have 5-6-7 or whatever, kids, all of them will not have IDENTICAL DNA because they each came from the same gene pool. Its going to be a little different for each child, its not guarenteed that sperm 1 & egg 1 are going to make a child like the other group of twins, what if sperm 6 & egg 2 make a child.......

Phf- ee bee;) Due January 26 (girl); 18 kids; Pennsylvania 5310 posts
27th Feb '13
Quoting Lizplustwo:" :!: True. If your example was true, then it would mean that the same parents would always produce genetically identical offspring. "


:!:

Tricia♥ [+4Boys] 4 kids; Indiana 5818 posts
27th Feb '13
Quoting forgive-n let*love:" Yes, i know that.. BUT if they reproduce, each child will NOT have the same DNA as their cousin/genetic ... [snip!] ... sperm 1 & egg 1 are going to make a child like the other group of twins, what if sperm 6 & egg 2 make a child......."


They won't have the same exact DNA, but genetically will be the same as siblings.

Phf- ee bee;) Due January 26 (girl); 18 kids; Pennsylvania 5310 posts
27th Feb '13
Quoting Tricia♥ [+4Boys]:" They won't have the same exact DNA, but genetically will be the same as siblings."


Yes, I understand that- SO is arguing that the children from each set/cousins, would be IDENTICAL & have identical dna. Which is wrong.

Amelia [a Mom] 1 child; 4 angel babies; Tallahassee, Florida 16483 posts
27th Feb '13
Quoting forgive-n let*love:" Yes, i know that.. BUT if they reproduce, each child will NOT have the same DNA as their cousin/genetic ... [snip!] ... sperm 1 & egg 1 are going to make a child like the other group of twins, what if sperm 6 & egg 2 make a child......."


Yes, just as with regular siblings.