Twins and siblings,

Genetics Studies of twins indicate a 34 to 51 genetic influence of likelihood to develop migraine headaches.

All twins do now and again.

Can't they really? That's the way twins are.

You're a twin expert.

Individual differences in susceptibility to diseases can be the consequence. This is nicely illustrated in identical twins, who show as they age increasing differences in the way that their identical DNA is marked by the environment.

Twins, speak when spoken to.

As for twins, especially identical twins you must have some idea yourself what agony of jealousy is possible.

Wrong.

The twins, as usual, are on opposite sides, and so their votes pair.

Twins, a Clinical Study, Mental traits of identical twins

No. One at the time twins looks likes singletons.

In my case. To add to my knowledge about identical twins.

She's not a nice girl, the twins say. And I agree.

Rates of premature menopause have been found to be significantly higher in fraternal and identical twins approximately 5 of twins reach menopause before the age of 40.

There are experimental designs, using twins, that can find out the extent to which intelligence and mortality are linked because they share environmental and genetic influences.

One with twins, about how it might affect the physical appearance.

The old saying, that one of the twins is likely to be abnormal.

It's not my fault that the twins let the cat out of the bag.

And scientists in the field remain puzzled by the fact that most identical twins (who share 100 of their genes) do not die from the same diseases.

And this happens in every pair of identical twins separated at birth ever studied but much less so with fraternal twins separated at birth.

What do you think I got here, a plane crash or a set of quadruplets?

In identical twins both are affected about 30 of the time, while around 5 for non identical twins and 2.5 of siblings are affected with a lower percentage of half siblings.

That's what twins are. Reflections of each other. Everything in reverse.

This is what happens in people who share half of their DNA fraternal twins.

The character, personality, nature can't duplicate personality, not even in twins.

And this happens in every pair of identical twins separated at birth ever studied but much less so with fraternal twins separated at birth.

My favorite example is a pair of twins, one of whom was brought up as a Catholic in a Nazi family in Germany, the other brought up in a Jewish family in Trinidad.

Finally, we know that how intelligent we are and how long we shall live are caused by both environmental and genetic influences. There are experimental designs, using twins, that can find out the extent to which intelligence and mortality are linked because they share environmental and genetic influences.

My team and I recently studied 36 pairs of identical twins, of which only one twin had breast cancer.

We haven t yet come across a large enough group of twins with such data.

And they were people who were not short of wit, or grace or energy, but they had no hope, no jobs, no prospects.

This is what happens in people who share half of their DNA fraternal twins.

Is there any foundation of the old popular belief that the twins are usually penalized by nature, either physically or mentally

Something called the Danish Twin Study established that only about 10 percent of how long the average person lives, within certain biological limits, is dictated by our genes.

So this might actually explain why, for example in twins, one of them might develop a genetic disease and the other one doesn't.

I don't want to be here all summer and be an object of ridicule for the twins and all of you.

Wrong. Identical twins, or any siblings, who are separated at birth are no less similar than if they had grown up together.

The Federers had another set of twins on 6 May 2014, this time boys whom they named Leo and Lennart, called Lenny.

A complementary finding, from a completely different methodology, is that adopted siblings reared together the mirror image of identical twins reared apart, they share their parents, their home, their neighborhood, don't share their genes end up not similar at all.

Something called the Danish Twin Study established that only about 10 percent of how long the average person lives, within certain biological limits, is dictated by our genes.

You can probably tell there are two sets of twins, the result of IVF technology, in vitro fertilization technology, due to some physical limitations I won't go into.

My favorite example is a pair of twins, one of whom was brought up as a Catholic in a Nazi family in Germany, the other brought up in a Jewish family in Trinidad.

For example, a set of triplets may be composed of identical twins from one egg and a third non identical sibling from a second egg.

They are the only primate group that regularly produces twins, which constitute over 80 of births in species that have been studied.