I thought they could tell by how many sacs there were.
2007-03-26 11:34:59 · 9 answers · asked by Anonymous in Pregnancy & Parenting ➔ Pregnancy
Okay, that's what I thought - fraternal = two sacs. So why do so many fraternal twins look identical??
2007-03-26 11:46:57 · update #1
If their is one sac and placenta then it is pretty definite that they are identical. But identical twins can have seperate sacs and placentas and fraternal can have a fused placenta so it looks like one. http://multiples.about.com/cs/funfacts/a/twinzygosity.htm
2007-03-27 04:52:43 · answer #1 · answered by mom2twinboys 4 · 0⤊ 0⤋
They can. Identical twins will be in the same sac, fraternal twins will be in individual sacs. There's a really interesting National Geographic show about being pregnant with multiples, if follows the pregnancies of different women, and shows how the babies look in the sacs.
2007-03-26 18:38:46 · answer #2 · answered by nimo22 6 · 2⤊ 0⤋
They can, identical twins are in the same sac. Fraternal twins are in separate sacs
2007-03-26 18:38:32 · answer #3 · answered by hollilynn 5 · 2⤊ 1⤋
Yes they can tell by how man sacs there are and fraternal twins don't look any more similar then any any other siblings. My younger sister had twins in her class that looked very different.
2007-03-26 19:28:46 · answer #4 · answered by Miriam Z 5 · 0⤊ 1⤋
Yes, as long as they can see everything clearly on the ultra-sound. They should be able to see if there are two sacs or one (two=fraternal, one=identical).
2007-03-26 18:41:36 · answer #5 · answered by Anonymous · 1⤊ 0⤋
they can identical twins are in the same sac and fraternal twins are in two
2007-03-26 18:40:01 · answer #6 · answered by lorileerdcm 2 · 1⤊ 0⤋
yes they can tell by how many sacs there are. if there are two separate sacs its identical twins if there is only one sac then there is identical twins.
2007-03-26 18:42:46 · answer #7 · answered by Happiness Is a Choice 2 · 0⤊ 1⤋
Because of the same reason that children born in different years to the same parents can look very similar. I've seen sisters who you would think were identical, who were years apart from each other.
2007-03-26 18:50:05 · answer #8 · answered by It's Just My Opinion 4 · 1⤊ 1⤋
They tell by how many babies ther is and how many sacs there are.
2007-03-26 18:39:34 · answer #9 · answered by mommy_2_liam 7 · 1⤊ 0⤋