fraternal twins

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Yasaman.herandy
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fraternal twins

Post by Yasaman.herandy » Mon Sep 08, 2008 2:07 pm

Dizygotic twins

Dizygotic twins (commonly known as fraternal twins, but also referred to as non-identical twins or biovular twins) usually occur when two fertilized eggs are implanted in the uterine wall at the same time. When two eggs are independently fertilized by two different sperm cells, DZ twins result. The two eggs, or ova, form two zygotes, hence the terms dizygotic and biovular.

Dizygotic twins, like any other siblings, have an extremely small chance of having the exact same chromosome profile. Like any other siblings, DZ twins may look similar, particularly given that they are the same age. However, DZ twins may also look very different from each other. They may be different sexes or the same sex. The same holds true for brothers and sisters from the same parents, meaning that DZ twins are simply brothers and/or sisters who happen to have the same age.


From Wikipedia, the free encyclopedia


Hey, I have a twin brother! We're fraternal ones! :lol:

MisterATP
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Post by MisterATP » Mon Sep 08, 2008 3:14 pm

And what of it? I have a twin sister...By the way I have a question about this.
Do twins come up random or there is something genetic contribution?

Darby
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Post by Darby » Tue Sep 09, 2008 6:15 pm

There are probably genes contributing to the chances of more than one ovum being ovulated in a cycle. Twins do sometimes "run in families."

Yasaman.herandy
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Re:

Post by Yasaman.herandy » Sun Sep 14, 2008 4:10 pm

Darby wrote: Twins do sometimes "run in families."

I agree with you; There are lots of twins among my relatives, but according to what wikipedia said it's just based on chance! :?

Darby
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Post by Darby » Tue Sep 16, 2008 8:29 pm

That tells you a lot about the reliability of Wikipedia...

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