If 2 sets of twins had kids would the kids have the same DNA?

Question

Okay they wouldn't, they'd have DNA like sister's right? (i thought it thru a bit)

e.g. like if Mary and Libby(identical twins) married Pete and john (identical twins) and both Mary and Libby had a daughter each they'd have the same DNA as bith sets of parents, BUT would DNA testing be able to tell which daughter belonged to which set of parents?

Everyone knows that identical twins have the same DNA, so if 2 sets got together and had kids would they too have the same/very similar DNA? - half from one parent and half from the other, which are essentially the same halves.

Answer 1

When gametes form, they undergo a process called mitosis and meiosis. during this process the chromosomes are split. The splitting of chromosomes is not exactly in the middle. The split is random and we can never predict which genes will move into one gamete and which will not. Therefore the likely-hood of children from 2 sets of identical twins to be the same is rare.

But if you do a DNA testing to find out the parents then it is difficult to pin-point who is the parent of the child. in a DNA test the cousins will appear as siblings.

Answer 2

Each of us has two sets of DNA - one set from each of our parents. However we can only pass on one set of DNA to a child, because it needs to get the other set from the other parent. If sets of DNA stayed complete, then this would mean that we would pass on all of a set of DNA from either our father our mother. However this is not what happens - we end up passing on some genes from each of the full sets of DNA we possess.

So the cousins would not have identical DNA, for precisely the same reason that siblings do not have identical DNA. However it would probably be impossible to determine definitvely which set of parents each cousin came from, unless one of the parents had an identifiable genetic mutation which his or her twin didn't, and this was passed on to the child.

Answer 3

no they wouldn't. even though the twins possess "nearly" identical DNA there are always differences. And the process of random fertilisation and crossing over of DNA ensure that every gamete produced is different. So although the children produced would seem more similar than most cousins they definately wouldn't have the same DNA.

Answer 4

I've read sometimes about identical twin brothers marrying identical twin sisters (like Marvin and Morgan Smith) and wondered if their children would look alike. I don't think it would be different enough to tell which child came from which parent--we can barely tell from the DNA of parents who are siblings but aren't twins.

Answer 5

ok...observed a narrative on a information tutor as quickly as a pair of one set of same twins that married yet another set. whilst that they had toddlers thier little ones weren't in basic terms cousins, yet they have been technically siblings with the aid of fact thier mothers and fathers have been same twins. same twins proportion the comparable DNA, besides the undeniable fact that if the twins have been faternal, then they ought to have the skill to tell them aside. yet...this is basically what I observed on 60 minutes or something.

Answer 6

It's really unlikely. I'm an identical twin and I always believed that my sister and I would have kids that looked alike when I was younger. but, there are so many different possible gamete combinations between the male and female that it is almost impossible. Plus when you add it genetic mutations it is very unlikely.

**Identical twins have different fingerprints because of mutations that occur while the baby develops** <--cool fact

Answer 7

i don't think so because how would you determine a father if he was a twin and they had both intercourse with a female and had a child the paternaty test would show only one to be the true biological father everyone should have there own dna i reckon even if they are a twin (i don't know though that is just my theory)

Answer 8

Ok so this will throw a spanner in the works, but what if all sets of twins were none identical then none of them would have the same DNA.

Answer 9

who says same halves. look up allele pairing. probably couldn't tell which set of the twins were the parents. they could tell which is which from birth records and bone age, finger prints, dental records, etc.

Answer 10

yes they'f be identical siblings. But theres a chance that there might be a mutation in one of the offspring, therefore destruying your theory