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i say that identical twins are the least rare because like me a fraternal twin i only know 1 pair of fraternal twin.






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Q: What are more rare fraternal or identical twins?
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Are quadruplets always identical or always fraternal or can they be either?

Quads can be identical, fraternal, or a pair of identical twins. Identical quads are rare- that would require 1 egg divide into 2, and then divide again into two. Most quads are fraternal.


How Do Fraternal Twins Occur and Identical Twins Occur?

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.


How do you determine who is the father if identical twins have same dna?

Identical twins will have the same father, so a paternity test is done just like for any kid. With fraternal twins, it is possible, but very, very rare, to have different fathers for the babies.


How is a fraternal twin different than other twins?

Fraternal means "brother-like." Identical twins result from a single fertilzed egg dividing into two separate embryos so the twins share all DNA. Fraternal twins result from two different eggs being fertilized by two different sperm at the same time. The babies are then born at the same time, but only share 25%of their DNA with each other, which is the same amount that siblings born at different times share. The word fraternal used in social organizations, like "the fraternal order of"...refers to the thought that the members are like brothers to each other. Modern french uses the word frere to mean brother.


Can identical twins be of different sexes?

They can be. While identical twins always have to be the same gender, fraternal twins usually are not. However this is not always the case. Identical twins occur because they inhabit the same egg. Fraternal twins because two eggs were fertilized at the same time. So fraternal twins could be the same gender, but usually they are of the opposite gender.


Clomid and twins?

Yes! I took Clomid for less than six cycles and the two times I actually ovulated I released more than one egg. In fact I am currently eight weeks pregnant with fraternal twins right now due to the clomid! So if you don't want twins, think twice! this is what i found on the web!Twin pregnancies may occur in as many as 5% of the women who use Clomid. Triplet pregnancies are far more rare.


Dads a non identical twin can his son have twins?

it's possible but twins are rare


Are twins that can only be two girls or two boys identical?

No. In order for them to be identical they needed to start off as the same cell and divide so at first their DNA is identical meaning they have the same sex. During development slight changes may occur but the sex always stays the same. Boy-girl twins are always two different cells meaning that they are not identical. The term for boy-girl twins is furturnal. You can however have boy-boy twins and girl-girl twins that are not identical and they are also called furternal. So basically, identical twins start off as one cell that divides and furternal are two individual cells. There is polar body twinning, that's when the egg splits before fertilization, and that can cause a male and a female. This is called semi identical twins or half twins. They share 75% of their genetic markers.


How do you know what kind of twins they are?

Genetic testing is the only way to positively identify what type of twins you are having. Identical or monozygotic (MZ) twins occur when a single egg is fertilized to form one zygote (hence, "monozygotic") which then divides into two separate embryos. Half-identical or semi-identical twins (also referred to as "half twins") are the result of a very rare form of twinning in which the twins inherit exactly the same genes from their mother but different genes from their father. Fraternal or dizygotic (DZ) twins (also referred to as "non-identical twins" and in cases of females, occasionally sororal twins) usually occur when two fertilized eggs are implanted in the uterus wall at the same time. When two eggs are independently fertilized by two different sperm cells, fraternal twins result.


Can dogs give birth to twins?

Yes they can but it's extremely rare. Most dogs usually give birth to single puppies in one litter but sometimes though, they can have two puppies born in the same sac which you would call twins but the identical kind not fraturnal. Just like humans, dogs can have sets of identical twins or fraternal twins. But the chances are, when your dogs is pregnant she may only have single puppies and no twins. But in one out of a million dog pregancies people have reported that their dogs gave birth to twins. It's rare but it's quite possible.


A brother and sister can be identical twins?

Yes and no, they are in the sense that both clones and Identical Twins do have the same DNA, however the way that the reproduction occurs in far different. Identical twins are "created" by a fertilized cell dividing in two forming two identical organisms. While clones go through a complex process, in which a nucleus is taken from a somatic (Body cell) and transplanted into a egg cell creating a new organism genetically identical to the firstHowever, Identical twins (nor are clones) aren't carbon copies of each other. Each twin goes through different environmental factors, so they are different people with different personalities and physical features.


Can you have twins if your uncle is a twin?

No, your husbands genetic ability for twins does not pass to you. It would pass onto any child you will have together. If you have the multiple birth trait in your family, you and your husband would have a high chance, but since it is only your husband any -daughters- you have may produce multiple births. The males will only pass the trait to the next generation, The mother is the one who's chances of twins is what matters in the pregnancy. The mother either has a genetic trait to release more than one egg (fraternal twins or more depending on the number of fertile eggs) or the single egg (for scientifical unknown reasons) will split causing identical twins, in extremely rare cases (1 out of 500,000 births) identical triplets. Hope this helps.:)