The difference between Gemini and Gemini lies in the fact that Twins (Identical Twins) are originated from of the same egg and sperm and the Gemini (Bessons Fraterns) are originated from different eggs and sperm.
| Twins | Twins | |
|---|---|---|
| Designation | Identical twins | Fraternal twins |
| Gynecological term | Monozygotic twins | Dicygotic twins |
| Fertilization | A single egg and a single sperm | Two eggs fertilized with two sperm |
| DNA | Twins share exactly the same DNA | Twins do not share the same DNA |
| Sex | Twins are always of the same sex | Twins may have the same sex or opposite sexes |
| Example | Twins Mary-Kate and Ashley Olsen | Actress Scarlett Johansson and her brother Hunter Johansson |
Twins (Identical twins)
The identical twins or twins they are born from the same part and their genesis is common to all, a sperm fertilizes an egg forming a zygote. The zygote transforms into twins when it divides and separates a few days after fertilization. That’s why the twins share exactly the same DNA therefore they are always of the same sex.
In gynecological terms identical twins are called as monozygotic twins originating from a zygote. The twins may or may not share the same bag. When the twins share the same bag and also share some organs they are called Siamese twins.
Twins (Fraternal twins)
The Twinsalso called fraternal twins, are two eggs fertilized by different sperm within the same menstrual cycle due to double ovulation. In gynecological terms it is called dicygotic twin at the origin of two zygotes. The twins develop completely independently, that is, always in different bags.
Thanks to the advancement of science and technology, it is now possible to know if you have a twin pregnancy on the first ultrasound, around 6 weeks of gestation.