Sep 04, · Best Answer: In over % of cases identical twins will be the same sex - they are what it says on the tin, identical. 1 egg, 1 sperm, 2 babies. However, there is a very rare anomolie that occurs where you can get twins that have come from the same egg and sperm but are opposite : Resolved.
Identical (monozygotic) twins are always of the same sex because they form from a single zygote (fertilized egg) that contains either male (XY) or female (XX) sex chromosomes. Fraternal twins can be either two girls, two boys, or one of each.
Monozygotic twins are genetically nearly identical and they are always the same sex unless there has been a mutation during development. The children of monozygotic twins test genetically as half-siblings (or full siblings, if a pair of monozygotic twins reproduces with another pair or with the same person), rather than first cousins.
The odds of having three sets of twins that are fraternal are one in , 3. The odds of having one set of identity and one set of fraternal twins is one in 10, 4. Once a mother has twins, the chances of having another set of twins quadruples. 5. Fraternal twins occur in one out of every 90 live births. 6. After birth, if one member of a pair of MZ twins had a sex change operation, that would also result in a pair of opposite sex MZ twins. So, while there is a tiny possibility that a male/female pair of twins could be MZ, it is highly unlikely.
Since monozygotic twins come from the same fertilized egg that splits, and the sex of the egg is determined before it splits, the gender of the twins is always the same. The only possible way for the gender to be different in identical twins is if some kind of incredibly rare mutation takes place to one of the fertilized egg.
So much so that many boy-girl twins have a much greater understanding and sympathy of the opposite sex than their single-born friends. Once again, the relationship between boy-girl twins is able to blossom, grow, and mature marking the way for a socially happy adulthood. Twins means occasional sweet fights with each other. And the origin dates back from the time we were in the womb. We would automatically sort out things soon after, as we did when we were in the womb. I and my sister are fraternal twins. We have been in the same school, in .
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Fraternal "twins" from _____ are not any more genetically alike than other siblings. Separate eggs. Identical twin. Same sex only. Fraternal twin. Same or opposite sex. To assess the impact of nature, how do we examine how genes make a difference within the same environment? Identical Twins will almost always be of the same sex. There have been 3 - 5 documented cases of opposite sex identical twins. This can happen in a set of identical boys, when one twin "drops" or "looses" a "Y" chromosome, resulting in a single chromosome, or an "XO" chromosome.
Semi-identical twins can be boy/boy, boy/girl or girl/girl, the discovery was made when a set of opposite-sex twins came into a hospital in for unrelated testing. According to the research, there are two theories about how these semi-identical twins happened. They can be of opposite sex. Identical twins are made from a single egg splitting and so they have the same characteristics such as DNA and blood type. These are hard to tell apart and are the same sex. Answer 2: Fraternal twins and identical twins differ in how the set of twins arise.
Identical twins always have the same sex and blood type. Though a few cases of identical twins of the opposite sex being born have been documented, this occurrence is extremely rare and unlikely. The term mirror twins, refers to the fact that they have the same physical features but opposite .