28/12/2025
Fraternal twins (dizygotic twins) start with two separate eggs released during ovulation, each fertilized by a different s***m, creating two unique zygotes (fertilized eggs). Each of these zygotes develops independently, forming two distinct embryos, each with its own placenta and amniotic sac, then implants into the uterine lining around day 6-10 post-fertilization, resulting in twins that are as genetically different as regular siblings.
Fertilization & Early Development
Double Ovulation: The woman's ovaries release two eggs in the same cycle.
Two S***m, Two Eggs: Two different s***m fertilize these two separate eggs.
Two Zygotes: This creates two unique zygotes (fertilized eggs), each with different DNA.
Cell Division (Cleavage): Each zygote starts dividing, forming a solid ball of cells called a morula, then a blastocyst (a hollow ball of cells).
Separate Sacs: Each blastocyst develops its own protective amniotic sac and placenta (chorionic sac).
Implantation
Around 6-10 days after fertilization, each blastocyst burrows into the uterine lining (endometrium).
This implantation process can sometimes cause light spotting (implantation bleeding) and cramping, though not always.
Key Characteristics
Genetics: Genetically unique, like any two siblings born at different times.
S*x: Can be the same s*x or different s*xes.
Appearance: May look very different from each other.
Placenta: Each twin has its own placenta and umbilical cord.
Dr. Ravishankar Kumar
