Question 1

how can identical twins be very different sizes?

Accepted Answer

Identical twins: Identical twins share a placenta. It certain circumstances the amount of placental blood flow to one twin may be more than to the other twin. That effects the growth of the twins.

Question 2

does identical twins have different sacs?

Accepted Answer

Some do some don't: If two twins share the same sac, they're identical. (almost always works.) the pathologist who examines the placenta can tell. Identical twins can have two sacs, or one sac; if there are two sacs, there can be one or two chorions.  Fraternal twins won't share chorions or sacs.

Question 3

can identical twins have their menarche come at different times?

Accepted Answer

Menarche: Yes. Just because they're identical genetically does not mean they'll do everything the same. Other factors contribute to puberty-timing, like weight gain. A bone-age x-ray can predict pubertal delay.

Question 4

identical twins have the same dna sequence, then how would you explain the different patches of sweat glands, can you explain?

Accepted Answer

We're complicated: The twins share the same DNA sequence but going from a fertilized egg to splitting into multiple cells to form a human can be influenced by several factors that can lead to individual differences. I found this article very helpful in answering your question.

http://multiples.about.com/od/funfacts/a/differenttwins.htm

Question 5

are fraternal or identical twins more common?

Accepted Answer

Yes: Fraternal twins are 3 times as frequent as identical. Fraternal twins happen when there is double ovulation and 2 eggs get fertilized. They are the type of twins that run in families. Identical twins come from 1 fertilized egg which separate in early gestation. Depending on when they separate, the babies can be in 2 distinct sac (di/di), 2 sacs within a shared sac (mono/di) or 1 sac (mono/mono).

Question 6

can there be male and female identical twins?

Accepted Answer

No..identical!: As the word identical means: identical! thus must be of the same gender. There are fraternal twins and that can be either gender or one of each...:-)).

Question 7

does children of identical twins who marry identical twins look alike?

Accepted Answer

Not always: They would be no more likely to look alike than any other siblings.

Question 8

is it possible identical twins can have the same gender of a child? what's the possibility?

Accepted Answer

50 percent.: 25 percent for both twins have a boy, 25 percent for both twins have a girl.  If you don't mind which sex, then 50 percent.

Question 9

why do identical twins share a placenta? is that even true?

Accepted Answer

Identical twins: 70% of identical twins share a placenta. REF:  https://fetus.ucsf.edu/twin-pregnancy-complications

Question 10

what's the difference between fraternal and identical twins genes?

Accepted Answer

Different, same.: Fraternal (dizygotic) twins share 50% of their genes, just like any other siblings. Identical (monozygotic) twins typically have the same 100% dna profile, as if clones of one another.

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Doctor answers about:

Different identical twins

A member asked:

How can identical twins be very different sizes?

A member asked:

Does identical twins have different sacs?

A member asked:

Can identical twins have their menarche come at different times?

A member asked:

Identical twins have the same dna sequence, then how would you explain the different patches of sweat glands, can you explain?

A member asked:

Are fraternal or identical twins more common?

A member asked:

Can there be male and female identical twins?

A member asked:

Does children of identical twins who marry identical twins look alike?

A member asked:

Is it possible identical twins can have the same gender of a child? what's the possibility?

A member asked:

Why do identical twins share a placenta? is that even true?

A member asked:

What's the difference between fraternal and identical twins genes?

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