2006-10-20 11:28:46 · 9 answers · asked by shishu45 2 in Education & Reference ➔ Trivia
Identical twins come from a single egg that splits. Fraternal twins are from two individual eggs that are fertilized simultaniously.
2006-10-20 11:33:23 · answer #1 · answered by docmurlo 2 · 1⤊ 1⤋
Fraternal twins come from the fertilization of two different eggs, whether it happens in the lab, as with in vitro fertilization, or spontaneously during a double ovulation (1 in 80-90 pregnancies).
Because of the technique of Assisted Reproductive Technique (ART), fraternal eggs are fertilized from 4 to 8 at a time, and anywhere from 3 to 6 are presented to the uterus (by insemination) for implantation. Of these, only some "take," the others miscarrying (silently because it's so early). Twins and triplets are becoming more frequent today because of ART. The less favorable fertilized eggs are not used, which may bring up ethical questions for the prospective parents depending whether they're pro-choice or pro-life.
Identical twins (and triplets!) come from the splitting of only one fertilized egg. These twins are called identical because, of course, they will have the same identical DNA (genes). Fraternal twins will look similar, but like brothers. Identical twins usually look very much alike.
An ultrasound can tell if the twins are identical only when there's one sac. But identical twins can also be seen with two sacs and with one or two placentas. It really depends on how early the fertilized egg was split. The earlier, the more likely a doubling of everything, including placenta and sac. The later, the more likely the two babies will share a placenta or a sac.
But fraternal twins are two babies from two ovulations and two fertilizations--there must be two sacs and two placentas. So in summary, a set of identical twins may present with only one sac, or with doubling of everything; fraternal twins must have a doubling of everything.
2006-10-20 11:31:38 · answer #2 · answered by Anonymous · 1⤊ 0⤋
1. identical twins develop after a single egg splitsa nd two fetuses develop, therefore they have the same dna
2. fraternal twins occur when two separate eggs are released and fertilized at the same time. They are siblings born at the same time but no more alike than other brothers and sisters.
2006-10-20 14:32:03 · answer #3 · answered by MUD 5 · 0⤊ 1⤋
If your question is identical twins and fraternal twins,the answer is identical twins look just alike and they share the same identical genes and whatever else.Fraternal twins doesn't favor in any kind of way and some share different genes from different men gross.But look it up it will tell you the difference.
2006-10-20 11:33:47 · answer #4 · answered by Sister Queen Mama 3 · 0⤊ 1⤋
Twins are identical, meaning they look the same, but fraternal means that they both came out of the mother, but they're two different people, not identical
2006-10-20 12:19:13 · answer #5 · answered by ~*Vanessa*~ 2 · 0⤊ 1⤋
The word "fraternal."
2006-10-20 12:19:45 · answer #6 · answered by The_Girl_With_Kaleidoscope_Eyes 4 · 0⤊ 1⤋
fraternal twins are twins that look NOTHING alike...
2006-10-20 12:06:50 · answer #7 · answered by Musiqbaby 1 · 0⤊ 1⤋
maternal twins-
2006-10-20 12:01:45 · answer #8 · answered by ash 4 · 0⤊ 1⤋
docmurlo said it best - accurate and brief.
2006-10-20 12:16:00 · answer #9 · answered by Anonymous · 0⤊ 1⤋