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

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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. ...Read more

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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. ...Read more

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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. ...Read more

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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 ...Read more

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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. ...Read more

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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. ...Read more

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Are fraternal or identical twins more common?

Are fraternal or identical twins more common?

Fraternal: More than 30% are monozygotic twins and nearly 70% are dizygotic. http://www.bjmg.edu.mk/record.asp?subrecordid=571 http://www.Sogc.Org/health/pregnancy-multiple_e.Asp. ...Read more

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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. ...Read more

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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%. ...Read more

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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. ...Read more