[neilep (OP)]

Dearest Twinologists.

twins eh ?....oh yes !!....ewe know what I mean eh ?...oh yesssss !!!!  []


Anyway....Say identical twin males each marry one of identical twin females ...will their offpsring look exactly the same ?

Also...would their DNA still be conclusive as to the parentage ?


whajafink ?



Neil
Twins !!  []
xxxxxxxxxxxx

[CliffordK]

Ahhh.
I was thinking you were asking about incest...
And was going to point out that identical twins have to be either both boys or both girls.

Anyway, for two pairs of identical twins marrying each other.

There will certainly be a similarity between the children.

However, the children won't be "the same".  As, each parent has two sets of genes, and gives half of them to the children.

With Gene Crossover & Recombination, there are essentially infinite combinations of genes that could be passed on to the children.

Anyway, comparing the cousins, they would closely resemble brothers and sisters.  Obviously between brothers and sisters within a "normal" family, there are some similarities, and some differences.

With a DNA test, the cousins would likely be indistinguishable from siblings.  Paternity tests would also be inconclusive.

[Don_1]

May I add to this kweschun from our fleecy friend, would there be any point in going to a wife swapping party?

[Nizzle]

Sure Don,
It's not cause they look identical that they don't each have their own bag of tricks

[rosy]

If there are two pairs of twins, A and a and B and b, and A marries B and a marries b...

A and a are genetically as close to each other as they are to themselves (that is, not all of anyone's cells are exactly the same because of copying errors.. but identical twins result from division of one embryo at an early stage).

Likewise B and b.

So when A and B have babies, those babies have 23 chromosomes, one of each from each of their parents. Each chromosome inherited from A is a shuffled-up mixture of the two chromosomes A inherited from her parents (well, except the sex chromosomes, but we'll ignore them..). Likewise, each baby will inherit a copy of each chromosome from B.

None of A and B's children will have chromosomes that are identical (unless A and B also produce identical twins), but they will each have 50 % of their genetic material from each of A and B.

Because a and b are genetically identical to A and B respectively, their children will be genetically as similar to their cousins as to their brothers and sisters.

Note that although the genetics are identical that doesn't necessarily mean that there wouldn't be other differences. Even identical twins have different experiences starting as soon as the embryo divides. One twin may get a stronger blood supply and send up bigger, or have an easier or harder birth, or catch a tummy bug or an ear infection that affects their developement over a few days, and these could all have small effects that might cancel out or act cumulatively to affect their physical health or behaviour, and these might lead to a different environment for the production of sperm (in the bloke) at the time of having kids, or might affect the environment in the womb (for the woman), or might affect the children's home lives and whether they look more or less similar.

[widereader]

As it is said, no two persons are alike.  Marrying twins with another set of twins would not guarantee the same offspring. There are different variations in the result of their DNA combinations.

[Bored chemist]

May I add to this kweschun from our fleecy friend, would there be any point in going to a wife swapping party?

I think it rather depends how many other couples turn up.

[CZARCAR]

ya but u gotta marry the first womb emerging twin to the second WET so to better balance the probability. What about clones?

[krool1969]

Abigail and Brittny Hansel are conjoined twin sisters joined from the chest down. They share one set of hips, legs and reproductive orgins. They are legally two people and would be allowed to marry two diffrent men. However any offspring would be the child of both twins. A paternity test could find which husband is the father unless both husbands are identical twin brothers.

[krool1969]

I know a pair of identical female twins who shared a boyfriend. They both got pregnant. I wonder if the children are considered half or full siblings. Are they also considered cousins?

[CliffordK]

I know a pair of identical female twins who shared a boyfriend. They both got pregnant. I wonder if the children are considered half or full siblings. Are they also considered cousins?

They would be genetically indistinguishable from full siblings.

However, they would be considered half siblings, half cousins. 

Depending on how involved the father is, the mothers may choose to just treat them as cousins.

[Bored chemist]

ya but u gotta marry the first womb emerging twin to the second WET so to better balance the probability. What about clones?

Why not just call them older and younger?
Anyway, I doubt it matters who comes out first.

[CliffordK]

ya but u gotta marry the first womb emerging twin to the second WET so to better balance the probability. What about clones?

Why not just call them older and younger?
Anyway, I doubt it matters who comes out first.

Identical twins are Nature's Clones.

Twins often like to know who was first...  so one can claim to be 15 minutes older than the other. 
With a difficult birth, the first twin might be slightly healthier than the second. 
However, there can also be developmental issues in the womb that could also cause differences between the two at birth which would be independent of birth order.

[CZARCAR]

ya but u gotta marry the first womb emerging twin to the second WET so to better balance the probability. What about clones?

Why not just call them older and younger?
Anyway, I doubt it matters who comes out first.

why do wombabes kick & move? My twinsnology is lacking but daresay the upper twin will be younger from mom never/rarely standing on her head during pregnancy?

[afizmyf8]

Is there any research about the gender being the same of the offspring of one identical twin and the other identical twin has all of the same gender?  I have an identical twin brother (mirror image) and he and his wife have four girls.  I have only had one child and it is a boy and my wife and I are trying to have another child and I am wondering if we are going to have another boy.
I have been researching for days for an answer to this question, but I haven't found anything about it.

[CliffordK]

Thinking about this question again.  There are often a couple of spontaneous mutations in an individual's cells, so if one did complete DNA sequencing, one may in fact, find subtle difference between the DNA of identical twins.

It is always interesting when a family has multiple same-sex children. 

However, for two children,
1/4 of the families will have 2 girls, 1/4 will have 2 boys (half having same sex offspring), and half having mixed.

for three children,
1/8 will have 3 girls, 1/8 will have 3 boys (1/4 total), and the rest will have some combination of boys and girls.

for four children,
1/16 will have 4 girls, 1/16 will have 4 boys (1/8 total), and the rest will have a combination.

I.E.  It is not too uncommon to have several children of the same sex.

In your case, should you and your wife choose to have a second child, attribute a 50/50 chance to male/female, and don't be surprised with either outcome. 

It would be odd to have two siblings, one with four daughters, and another with four sons, but such an occurrence isn't impossible.

Your brother already having four daughters doesn't change your chances of having 3 more sons.