I think so. My twins are three days apart according to every ultrasound so far. It seems perfectly reasonable that they could be up to a week apart especially considering that is about how long strong sperms keep on working within the right environment. I am not a Dr., but my guess would be it must be possible. Take care
While it is possible for non-identical (dizygotic/2-eggs) twins to be conceived apart (and by different fathers!), it's generally not the case. An ultrasound showing twins differing in age by 3 days is not significant given the margin of error for ultrasound technology. Just like most adults are different sizes, so too are babies in utero owing to genetic and environmental factors.
Another name for fraternal twins is dizygotic twins.
Two separate eggs are fertilized. Dizygotic twins are the same as fraternal twins.
How do fraternal twins form? Answer one egg from each ovary is fertilized.
No, dizygotic twins are fraternal twins. Monozygotic twins are identical twins.
Identical twins are called monozygotic. Fraternal twins are called dizygotic.
The frequency of having monozygotic twins (identcal) is about 4 out of every 1000 births. Whereas dizygotic twins (fraternal) is about 12 out of every 1000.
Dizygotic twins develop from two separate ova fertilized by different sperm at roughly the same time, they are also called fraternal twins. Monozygotic twins develop from one zygote that splits apart producing genetically identical zygotes; also called identical twins.
There are two types of twins -- monozygotic ("identical") from a single egg, and dizygotic (fraternal) from two eggs. Only dizygotic twins can have a different sex.
Monozygotic twins are formed from the splitting of a single fertilized ovum, and are identical. Dizygotic twins are formed from two separate fertilized ova, and are genetically different. They are also called fraternal twins.
Nonidentical twins Dizygotic twins (commonly known as fraternal twins, but also referred to as non-identical twins or biovular twins)
They are dizygotic. Fraternal twins.
And what about monozygotic different gender twins (M/F)
Twins can be identical or fraternal (monozygotic or dizygotic). For identical twins, one sperm fertilizes an egg. The zygote divides into two identical embryos. For fraternal twins, two separate eggs are fertilized. They both implant on the uterine wall, forming two zygotes.
Non-identical twins are called fraternal or dizygotic because they develop from two separate eggs that are fertilized by two separate sperm.
Fraternal twins generally happen when two eggs are fertalized and then implant themselves in the wall of the uterus. They are also known as Dizygotic Twins, this is a link to some information on twins, hope you find this helpful http://en.wikipedia.org/wiki/Twins
Identical twins are when one egg in the fallopian tube is fertilized and then when it reaches the womb it splits into two eggs. Fraternal twins are made when two different eggs from each fallopian tube are fertilized at the same time.
Not usually no. Fraternal twins are conceived from separate eggs within the mothers womb. While identical twins start as one embryo and then split and grow into 2 babies. If a woman was sexually active with more than one man it is possible for fraternal twins to have different fathers, but it is extraordinarily rare.
Dizygotic twins .
fraternal twins who were raised apart
Fraternal twins are more popular.
Fraternal twins (dizygotic twins) are simply two fertilized eggs that are implanted in the uterus at the same time. Identical twins (monozygotic twins) is one fertilized egg that separates into two embryos. In most cases, identical twins share one placenta, but have separate amniotic sacs. In some cases, they have two placentas. In rare cases, they share both the placenta and the amniotic sac.
There is no precise percentage of fraternal or identical twins but it is estimated that 2/3 of all twins are fraternal where as 1/3 of twins are identical.
identical twins are single egg twins. fraternal twins a two egg twins. fraternal
In general, it is believed that having fraternal (dizygotic) twins can be genetic and that this predisposition can cause women to be more likely to release more than one egg at a time, offering the chance for more than one egg to be fertilized at a time. Other factors that can increase your chances of having fraternal twins include using fertility treatments and a mother being over 35-40 years old when she becomes pregnant.