# A DNA Question **URL:** \ **Category:** Miscellaneous and Personal Stuff I Must Share\ **Created:** [January 25, 2001, 6:54am UTC](https://boards.straightdope.com/t/a-dna-question/51693 "2001-01-25T06:54:10Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Skarecrow](https://avatars.discourse-cdn.com/v4/letter/s/bbce88/32.png) [@Skarecrow](https://boards.straightdope.com/u/Skarecrow)\ **Post date:** [January 25, 2001, 6:54am UTC](https://boards.straightdope.com/t/a-dna-question/51693/1 "2001-01-25T06:54:10Z")
A woman has sex with identical twins in the same night and gets pregnant. Can they find out who the father is? ---
**Author:** ![St.Attila](https://avatars.discourse-cdn.com/v4/letter/s/e99b99/32.png) [@St.Attila](https://boards.straightdope.com/u/St.Attila)\ **Post date:** [January 25, 2001, 7:58am UTC](https://boards.straightdope.com/t/a-dna-question/51693/2 "2001-01-25T07:58:17Z")
Not from DNA. Doesn’t this belong in GQ? ---
**Author:** ![Tequila\_Mockingbird](https://avatars.discourse-cdn.com/v4/letter/t/41988e/32.png) [@Tequila\_Mockingbird](https://boards.straightdope.com/u/Tequila_Mockingbird)\ **Post date:** [January 25, 2001, 8:11am UTC](https://boards.straightdope.com/t/a-dna-question/51693/3 "2001-01-25T08:11:48Z")
If he had more details, I’d say Penthouse Forum. ---
**Author:** ![friedo](https://avatars.discourse-cdn.com/v4/letter/f/8edcca/32.png) [@friedo](https://boards.straightdope.com/u/friedo)\ **Post date:** [January 25, 2001, 8:31am UTC](https://boards.straightdope.com/t/a-dna-question/51693/4 "2001-01-25T08:31:03Z")
AFAIK, there is no way at all to determine the father. DNA between identical twins is, well, identical. ---
**Author:** ![St.Attila](https://avatars.discourse-cdn.com/v4/letter/s/e99b99/32.png) [@St.Attila](https://boards.straightdope.com/u/St.Attila)\ **Post date:** [January 25, 2001, 8:47am UTC](https://boards.straightdope.com/t/a-dna-question/51693/5 "2001-01-25T08:47:10Z")
🙂 Tequila Mockingbird, you smart-ass. ---
**Author:** ![Typo\_Negative](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/typo_negative/32/484_2.png) [@Typo\_Negative](https://boards.straightdope.com/u/Typo_Negative)\ **Post date:** [January 25, 2001, 12:24pm UTC](https://boards.straightdope.com/t/a-dna-question/51693/6 "2001-01-25T12:24:05Z")
Whichever one has the most money.😃 ---
**Author:** ![Fiver](https://avatars.discourse-cdn.com/v4/letter/f/e274bd/32.png) [@Fiver](https://boards.straightdope.com/u/Fiver)\ **Post date:** [January 25, 2001, 1:25pm UTC](https://boards.straightdope.com/t/a-dna-question/51693/7 "2001-01-25T13:25:18Z")
Don’t be sexist, **Skarecrow** ; there’s another side to this question. Say a man has sex with identical twin sisters. A pregnancy results. Is there any way to tell which one is the mother? ---
**Author:** ![mnemosyne](https://avatars.discourse-cdn.com/v4/letter/m/c4cdca/32.png) [@mnemosyne](https://boards.straightdope.com/u/mnemosyne)\ **Post date:** [January 25, 2001, 5:40pm UTC](https://boards.straightdope.com/t/a-dna-question/51693/8 "2001-01-25T17:40:48Z")
**Five** Yes! And I’m not talking about the obvious “which woman went through labour…” From what I understood in my biochem class yesterday, some fetal blood cells (nucleated) can enter the mothers blood stream, and these cells would have the child’s DNA. Now I don’t know how long those cells are there for, or if they degrade or anything (maybe after tomorrows class I’ll know more), but my WAG would be that a blood test of each woman could possibly reveal the fetal cells, hence indicating which was the mother. Though how there could have been doubt to begin with…maybe one of those weird Springer-type “I want my sister’s man, so I claim to be the mother of their children and he can’t tell us apart” situation? ---
**Author:** ![Fiver](https://avatars.discourse-cdn.com/v4/letter/f/e274bd/32.png) [@Fiver](https://boards.straightdope.com/u/Fiver)\ **Post date:** [January 25, 2001, 6:05pm UTC](https://boards.straightdope.com/t/a-dna-question/51693/9 "2001-01-25T18:05:28Z")
**mnemosyne** , I was making a joke. I’ve been known to do that from time to time. ---
**Author:** ![system](https://global.discourse-cdn.com/straightdope/original/2X/e/e489c3b7d8fce19c4b355dd4fc3f88cc39c34b87.png) [@system](https://boards.straightdope.com/u/system)\ **Post date:** [January 25, 2001, 6:08pm UTC](https://boards.straightdope.com/t/a-dna-question/51693/10 "2001-01-25T18:08:01Z")
the real question is: a woman has sex with identical twins on the same night. She gets pregnant. Does it matter who the father is?