Top
20
Doctor insights on: How Can Identical Twins Be Very Different Sizes

Share
1

1
How can identical twins be very different sizes?

How can identical twins be very different sizes?

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.

2

2
Does identical twins have different sacs?

Does identical twins have different sacs?

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.

3

3
Can identical twins have their menarche come at different times?

Can identical twins have their menarche come at different times?

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.

4

4
Identical twins have the same DNA sequence, then how would you explain the different patches of sweat glands, can you explain?

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

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

5

5
Are identical twins always identical?

Twins: Not necessarily. Personality-wise, there is a pair of identical twins in my practice who have different personalities. One is an extrovert and athletic in nature while the other is introverted.

6

6
Can there be male and female identical twins?

Can there be male and female identical twins?

Identical twins: Identical twins are always the same sex. They have the same genetic endowment. Fraternal twins are siblings that were in utero together. Fraternal twins can be the same sex or the opposite sex.

See 1 more doctor answer
7

7
Are fraternal or identical twins more common?

Are fraternal or identical twins more common?

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).

See 1 more doctor answer
8

8
Does children of identical twins who marry identical twins look alike?

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

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

9

9
Is it possible identical twins can have the same gender of a child? What's the possibility?

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

If you are asking: If two identical twins, say both are women giving birth at the same time, have a higher chance of having the same gender for their babies, then the answer is no. The probability is 50% for 1 twin mother and 50% for the other twin mother delivering both a boy, 0.5 x 0.5 = 0.25 or 25%, but adding to the same probability for a girl. So 25% both girls + 25% both boys = 50%.

See 1 more doctor answer
10

10
Do identical twins both develop autosomal dominant disorders?

Do identical twins both develop autosomal dominant disorders?

Yes: They occur when one fertilized egg & sperm split in to two pregnancies, so will share all features, good and bad.

11

11
What's the difference between fraternal and identical twins genes?

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

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.

12

12
Could a 5 day frozen blastocyst be divided into identical twins after transfer?

Could a 5 day frozen blastocyst be divided into identical twins after transfer?

Yes: Actually this is slightly more common after day five transfer ~1%. Since the embryo is in nearly hatching or hatching, the transfer "pressure" can cause the embryo to split into identical twins. This is one of the disadvantages of day 5 transfer. Good luck.

13

13
Do identical twins have the same fingerprint?

Do identical twins have the same fingerprint?

No: I understand that every person has unique finger prints.

14

14
Do identical twins have the exact same DNA?

Do identical twins have the exact same DNA?

Yes: Identical twins start off with the exact same DNA. Small mutations can occur, so there might be slight differences that develop.

15

15
Can an orgasm kill an unborn identical twin? Should orgasming be stopped due to identical twins or MoMo twins?

Can an orgasm kill an unborn identical twin? Should orgasming be stopped due to identical twins or MoMo twins?

No, if all is normal: A fetus can die after the pregnant woman has an orgasm, but can also die before she has an orgasm. A fetus can die after the woman eats a peanut butter and jelly sandwich. All these things do happen, BUT are they related? The answer is NO, unless the woman has a problem that causes two things to be related (such as having a peanut allergy, and a life-threatening reaction after a PB&J sandwich).

16

16
Are identical twins a product of the mother or father?

Are identical twins a product of the mother or father?

Both: A fertilized egg cell will split into two separate embryos, and grow into identical twins. A common misconception about identical twins is that the trait for having them is passed on to future generations through the mother's genes. But the truth is science doesn't know the reason why identical twins occur. At this time, we can just say that they're examples of a nine-month double miracle.

17

17
If you have identical twins, will they both develop the same genetic/inherited disease at the same point?

If you have identical twins, will they both develop the same genetic/inherited disease at the same point?

Depends: If it's something that fully expresses itself with no modification (such as huntington's), yes. If it's going to express itself but is lifestyle-modifiable (type ii diabetes), timing will differ. The diseases for which there's a genetic component (diabetes, lupus, multiple sclerosis, many others) have only one twin affected more often than not -- you can find details.

18

18
After healthy heart rates are identified in identical twins, what is the probability of a vanishing twin?

After healthy heart rates are identified in identical twins, what is the probability of a vanishing twin?

Fairly common: A conservative estimate of frequency is that vanishing twin syndrome occurs in 21-30% of multifetal pregnancies. More commonly identified now that first trimester ultrasound is widely used. There are no known preventive measures since the loss usually occurs because of cord implantation abnormalities. Thanks for trusting HealthTap!

19

19
My Husband has multiple sets of fraternal twins on his side and I have identical twins on my side, is the twin gene carried on the male side or woman?

My Husband has multiple sets of fraternal twins on his side and I have identical twins on my side, is the twin gene carried on the male side or woman?

Female Side: Genetic increase for twins is due to female tending to ovulate more than one egg at a time, so trait is for fraternal twins (not identical) and carried by mother.

20

20
Why would my pediatrician be concerned about my 15 month (13 adjusted) identical twins girl's height?

Why would my pediatrician be concerned about my 15 month (13 adjusted) identical twins girl's height?

We always watch it: Pediatricians always watch the height, weight, and head size for a baby or toddler. That's how we know if the growth is fine. Sometimes, two or three measurements are needed to get an accurate number on a squirming baby. We get concerned if a number is "off the graph" on the growth chart, or if numbers are trending too high or low for a particular child compared with her peers, sibs, or parents.

See 1 more doctor answer