If my sister was missing and DNA matching hers was found in my truck, that she had never been in, would you suspect that I killed her?

I'm not sure that there is such a thing as a "100% conclusive match" in DNA testing.

Are you female? If you are, then your DNA is probably identical to your sister's, and I don't think there's any conclusion you could draw here.

The simplest conclusion is just that it's not true that your sister had never been in your truck. It seems a long leap from "she's missing" to "you killed her".

But, aren't you saying that your DNA and your sisters is the same? So, the DNA in your truck could be your own. So, bad evidence.

no due to your matching dna and there is no evidence of her death.

Is this a thinly disguised Maddy question? I'd say no.

I'm your twin. If I go missing, check Hawaii.

Yes, I did base it on the Maddy case. Weak DNA wont work even in the case of regular siblings, because the DNA is so close. When 2 siblings have been in a car, they can't tell Maddy's from theirs using weak DNA tests. There are too many people who assume "the parents killed her" because of this body fluid DNA "match".
Kudos to people who know that my sister and I have identical DNA.

> I'm not sure that there is such a thing as
> a "100% conclusive match" in DNA testing.
>
Oops. I probably screwed up the wording there. D'oh.

Not when it could easily be your DNA, no - at least, not if that was the only "evidence" against you.

Though it would be a cool way to cover it up if you did kill her...

Are you a guy or a girl? Somehow I don't think that if you were a guy you could have a 100% matching ID with your sister. Unless somebody is not telling the truth...

Also, if we lived in the same town and one of us committed some crime, how would they determine which one of us did it?

Probably. People are guilty until proven innocent, after all.

It's impossible for boy/girl twins to be identical twins. They will always be fraternal, which is not going to be identical DNA.

The perfect defense! Although, there are probably all kinds of other chemical markers that they could look for in the kind of material they might test for DNA. Don't start framing your sister until you're sure you can get away with it!

I'm printing a copy of this page. It will be on file at the police station, just in case.

> It's impossible for boy/girl twins to be identical twins. They will
> always be fraternal, which is not going to be identical DNA.

Believe it or not, there are a couple of recorded cases of identical twins of different sex. I'm not sure of the exact mechanism - but I imagine it involves some pretty impressive post-conception (and post separation of the embryos) genetic mutation, or it might only occur where there's the wrong number of sex chromosomes (e.g. XXY instead of XX) in both twins. I suppose you could argue that unless they have XX and XY chromosomes that they are not strictly male *or* female though...but still, pretty interesting.

I'm going to have to go away and look this up properly now - there goes the next hour of my time!

Just in case you commit a crime and want to frame me?

> I'm printing a copy of this page. It will be on file at the police
> station, just in case.

Please don't name me as an accomplice!

> I'm going to have to go away and look this
> up properly now - there goes the next hour
> of my time!

I'd never heard of this and I'm always reading stuff about twins! I have too much to do today, so I'll probably look when I have the time to sit and surf that long.
On a side not, once I saw on one of those "who's my baby's daddy" shows, a girl who didn't know which guy (twin brothers) was the dad. They thought they were fraternal twins, and the DNA results came back-and it was found that they were identical and they couldn't tell who was the dad. I might have mentioned that before in another survey. lol

If she's your identical twin, then you have exactly the same DNA. How would I know it was hers and not yours?

This article is pretty interesting - from a developmental biology textbook.
And this has a bit more about it.

Oh, and back to you and your sister farming one another - what about fingerprints? Aren't they at least partly determined by the environment rather than genetics?

I dont even know if we have the same finger prints but thats what gloves are for. hehe

Gloves are for leaving behind fibers.

You're giving this way too much thought!

If you're identical twins, then your DNA would be identical to hers.

If the DNA match is 100% then who's to say the tested sample isn't yours?

> I'm your twin. If I go missing, check Hawaii.

Or Buffalo Bill's basement?

Nah, I'm more likely to be frolicking on the beach.

Nude beach?

There is at least one of those in Hawaii. I think it's called Secret Beach, but I could be wrong about that.

Yeah, but you gonna be there?

Why? Should I be? Do my favorite musicians hang out there?

Could be.

In the case of identical twins, it isn't the DNA they will look at. Yes, it will be identical, but as you grow you get different antibodies, different markers and that is what they will look at. So, if they only check DNA then finding a match is no help. They need to look further.

No, they'd probably treat you as an anomolie, oh screw the word you know what I talking about.

no because if you are twins it could be your DNA

> In the case of identical twins, it isn't
> the DNA they will look at. Yes, it will be
> identical, but as you grow you get different
> antibodies, different markers and that is
> what they will look at. So, if they only
> check DNA then finding a match is no help.
> They need to look further.

Cool. I learn something new every day!

If you're identical twins, it would be difficult, if not impossible to differentiate your DNA from that of your twin sister. There have been several paternity cases in past years where there was difficulty in determining which twin was the father since their DNA was the same.

No, identical twins share the same DNA, as I explained in the my previous comment, but your fingerprints would be different.

No, it is possilbe that she WAS in your truck before, you just didn't know about it. Well, I might suspect you if I had something else to go by IN ADDITION to this piece of info.

yes I work for CSI Crime Scene Investigation and you are innocent until proven guilty beyond a shadow of a
doubt or Law and Order could take you to court and find you guilty

Also, save for the possiblity that someone didn't just steal your truck and brought it right back.

> I'm not sure that there is such a thing as a "100% conclusive match"
> in DNA testing.
>
> Are you female? If you are, then your DNA is probably identical to
> your sister's, and I don't think there's any conclusion you could
> draw here.
>
> The simplest conclusion is just that it's not true that your sister
> had never been in your truck. It seems a long leap from "she's missing"
> to "you killed her".

CSI Crime Scene Miami or Law and Order and the way they produce a crime scene would find you guilty
probably of a crime Ro

> CSI Crime Scene Miami or Law and Order and the way they produce a crime scene would
> find you guilty probably of a crime Ro

Yes, and then David Caruso would have a knife fight with you or use his mad sniper skills on you...

If you are identical twins, isn't your DNA identical to hers? So it's your DNA in the truck, not hers.

If your sister is your identical twin, you have the same DNA. So the DNA in your truck that matches hers is presumably from you, not her.

they did have a nasty knife fight with me and killed me and those sniper skills they used on me ouchh
a body with bullet holes

Then that really nice coroner stroked your hair and your cheek and cooed and said "poor baby, she neveh had a chance against Horatio Caine".

> Then that really nice coroner stroked your hair and your cheek and
> cooed and said "poor baby, she neveh had a chance against Horatio
> Caine".

and now here I am in the Morgue and doing an autopsy on me and slicing me open boo" hoo"

I don't know.

They can't tell twins' DNA apart, can they?

I thought the DNA of twins was identical. Am I wrong in assuming that?

FoxTurtle smells a conspiracy, so...