can 1 egg make twins?
7554
Just the two of us Fraternal twins are formed when two eggs meet two sperm in the womb. Each is fertilized independently, and each becomes an embryo. With identical twins, one egg is fertilized by one sperm, and the embryo splits at some later stage to become two.
813392
Identical twins: only one egg is fertilized but it divides onto 2 embryos. So they have the same genetic info. Fraternal twins: two separate eggs are fertilized by separate sperms.
378828
Each is fertilized independently, and each becomes an embryo. With identical twins, one egg is fertilized by one sperm, and the embryo splits at some later stage to become two. Occasionally, two sperm are known to fertilize a single egg; this 'double fertilization' is thought to happen in about 1% of human conceptions.
1315394
By themselves, double yolks are fairly rare – you might find them in 1 of every 1,000 eggs. These eggs typically come from our younger hens who are still learning how to lay eggs.
187245
Identical (monozygotic) twins happen when a single egg (zygote) is fertilised. The egg then divides in 2, creating identical twins who share the same genes. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys.
1245975
Yes - twins can be conceived at separate times and even by separate fathers, but only within a few hours or days in-between. Fraternal twins are the result of two eggs being present and fertilized to gestate concurrently.
524975
The first involves a single egg being fertilized by a single sperm. Reproduction 101, right? But then, somewhere along the way, the fertilized egg divides into two, resulting in identical twins. The chances of having identical twins is relatively rare — around 3 or 4 in every 1,000 births.
1439758
So if you, your mother or your maternal grandmother are or were fraternal (non-identical) twins then your chances of having twins may increase to as many as 1 in 7. But if none of these apply to you and you're keen to have twins, don't despair.
1040663
While fraternal twins (2 eggs and 2 sperm) are always surrounded in their own sacs and have their own individual placentas, 70% of identical twins may end up sharing a single placenta.
450308
Identical twins Identical (monozygotic) twins happen when a single egg (zygote) is fertilised. The egg then divides in 2, creating identical twins who share the same genes. Identical twins are always the same sex, so if your twins are identical, you'll have 2 girls or 2 boys.
278621
Yes, brother and sister can be identical twin or monozygotic twin but in very very rare case. Occasionally, in this rare case, an egg contain three sex chromosome (XXY). ... After monozygotic twins seperate in the womb, either one can have mutations and some cells can end up having slightly different DNA.
381326
There are many different kinds of twins, including fraternal twins (two eggs and two sperm), identical twins (one egg and one sperm), mirror image identical twins (separation on day 5 of development), identical twins with two placentas, one placenta and two sacs, one placenta and one sac, and finally conjoined ...
826588
Identical twins The first involves a single egg being fertilized by a single sperm. Reproduction 101, right? But then, somewhere along the way, the fertilized egg divides into two, resulting in identical twins. The chances of having identical twins is relatively rare — around 3 or 4 in every 1,000 births.
709759
Dizygotic twins form from two separate eggs fertilized by two separate sperm. ... If sexual intercourse or insemination occurs and the eggs are fertilized, multiples can result. Dizygotic twins occur when two eggs are fertilized by two sperm, implant in the uterus, and develop into two fetuses.
287621
Fraternal twins are formed when two eggs meet two sperm in the womb. Each is fertilized independently, and each becomes an embryo. With identical twins, one egg is fertilized by one sperm, and the embryo splits at some later stage to become two.
62414
While fraternal twins (2 eggs and 2 sperm) are always surrounded in their own sacs and have their own individual placentas, 70% of identical twins may end up sharing a single placenta. ... As a result, although identical twins usually share the same genetic material, they may actually grow differently.
227015
Having identical twins is not genetic. On the other hand, fraternal twins can run in families. ... However, for a given pregnancy, only the mother's genetics matter. Fraternal twins happen when two eggs are simultaneously fertilized instead of just one.