Twins are caused on one of two conditions.
The first possibility is that two eggs were released from the mother and both were fertilized. The second possibility is that one egg was penetrated simultaneously by two sperm.
There are two types of twins, identical and fraternal. Identical twins come about by the splitting of a zygote (fertilised egg) at some stage. This is completely random and the incidence is the same in all races. My husband and his borther are identical twins. Fraternal twins are produced when two eggs are fertilised by two sperm in the same menstrual cyle. They may be of the same sex or opposite sexes and are no more alike that any other brothrs and sisters. Fraternal twins are more common in older, well-nourished, fertile women (or if two embryos are implanted after IVF) and vary between races. Some African peoples have a very high rate of fraternal twinning with far Eastern races having the lowest rate. Two of my children are fraternal twins. Photographs on my Bio page englishangel
Conjoined twins result when the zygote of identical twins fails to completely separate. That being said, identical twins occur when a single zygote, that is, a fertilized egg, divides into two separate embryos. The embryos will then, with all conditions met, develop into fetuses sharing the same womb. When the zygote doesn't fully separate, the embryos develop into fetuses without dissolving their connection.
Conjoined twins are always identical; fraternal (non-identical) twins are the result of two separate eggs being fertilized by two separate sperm and being so, avoid the incomplete division necessary to form conjoined twins.
Conjoined twins used to be called Siamese twins if that is what you mean. The politically correct term is now conjoined twins.
This is a splitting defect, in which a single fertilized egg or zygote starts to separate into two distinct individuals but does not complete the process.
You can't prevent it.
Yes, in both cases.The mutation causes both of the identical twins to look different from the rest of the family.The mutation causes one of the identical twins to look different from the other twin. That is, the mutation happened shortly after the cells that gave rise to both twins divided.
Nonidentical twins Dizygotic twins (commonly known as fraternal twins, but also referred to as non-identical twins or biovular twins)
Conjoined twins or siamese twins.
They are called: fraternal or dizygotic twins. Twins who develop in one amniotic sac are called identical or monozygotic twins.
Monozygotic Twins
A female mammal causes twins.
Yes, in both cases.The mutation causes both of the identical twins to look different from the rest of the family.The mutation causes one of the identical twins to look different from the other twin. That is, the mutation happened shortly after the cells that gave rise to both twins divided.
No. Twins are determined by the cow herself, not the bull. It's still unclear as to what causes the act of twinning, even in humans.
Its at 50/50 chance... The twin or female double egg is what causes twins... its on the woman's side of the family..
Every sibling will loook different unless they are identical twins
Most likely not, as it shows to skip a generation. It skipped your grandma, so by logic, the pattern is yes-no-yes-no. You would the the fourth no. It will also depend on which side of the family the twins were on. The propensity to have fraternal twins can be inherited as a female trait that causes more than one egg to be dropped at a time. Identical twins have no genetic relationship that has been found to date.
identical twins are single egg twins. fraternal twins a two egg twins. fraternal
There is Identical twins, Nonidentical twins and Conjoined twins.
Yes they are twins. They are monozygotic twins (identical twins).
The twins
At the end of Chapter 20 in "The Giver," it is revealed that Jonas's father is responsible for the release of twins, which involves euthanizing one of the twins. This revelation shocks Jonas and causes him to question the society he lives in.
twins'. Since twins are 2 people, it will be twins'.