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Doctor insights on: Obesity Identical Twins Separated At Birth

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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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Dr. Quang Nguyen
4,506 doctors shared insights

Obesity (Definition)

The definition started with Louis Israel Dublin, chief statistician of the Metropolitan life insurance company, in the early 1940s, as a BMI >25 (definitely >30) for people in their 20's based on retrospective observational life insurance data of the age at which people died later in life. This was subsequently adopted by the medical disease industry. However, BMI is ...Read more


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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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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. ...Read more

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Do identical twins have the same fingerprint?

Do identical twins have the same fingerprint?

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

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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. ...Read more

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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. ...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 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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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. ...Read more