Fraternal twins can be the same sex or opposite sexes. It doesn't matter.
it was never discovered,its like asking who discovered sex
Assuming no student is intersex, the answer is 3.
Sex-liked means liking sex and sex determined is the resolution to have sex.
It's funny because 69 (as a sexual position) represents a couple doing mutual oral sex at the same time!
Do you mean SECS as in sex or sexual intercourse? Because that sex is between a male and a female were the male inserts his penis into the females virgina and then start going in and out at the opposite time untill an organism is achieved, if you dont use condoms the female could get pregnant. The other secs is short for seconds.They both sound the same. Sex and secs is very different!
No. All identical twins are the same sex. Judith and Hamnet were opposite sexes, and so were fraternal twins.
If two fraternal twins have the XY sex chromosomes, they will be male.
Yes. Conjoined twins are always identical (monozygotic) twins, and identical twins are always the same sex.There is a theoretical case where identical twins could be opposite genders, when the babies are female but in one of the females, a branch of one X chromosome breaks away; however, I don't believe this has ever been observed.
If a boy and a girl are twins, they are known as fraternal twins. Fraternal twins result from the fertilization of two separate eggs by two separate sperm cells, whereas identical twins result from the fertilization of a single egg by a single sperm cell that later splits into two embryos.
Nature has various safety valves. That is one of them. Conjoined Twins are identical twins with a natural connective bond, therefore they always take the same sex. Fraternal twins, like the fictional Bobbseys, can be Boy and Girl.
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.
Unlike identical twins, fraternal twins come from two separate eggs each getting fertilized by a separate sperm. Now these sperms can both carry an X chromosome or a Y chromosome giving rise to fraternal twins of the same gender. But at times one could carry the X chromosome and the other could carry the Y chromosome resulting in twins of opposite gender.
Twins who are of the opposite sex or do not look alike are fraternal twins ~ not identical. This means that at the time of their conception ~ two eggs were fertilised. In the case od identical twins, one egg is fertilised and split in half.
I am pretty sure because that is how my twins are at the moment that one placenta and two sacs mean identical twins more often than fraternal and more often identical if they are the same sex
Identical Twins are the result of a single fertilized egg spliting in two producing two genetically identical children. Fraternal twins are the result of the mother producing two eggs each fertilized by a different sperm from the father. This can result in opposite sex twins.
boy, girl and simese twins Siamese twins are now properly called conjoined twins. You can have identical twins[ same sex] , fraternal twins [ one male , one female ]. triplets, same way, quadruplets, quintuplists , sextuplets and so on , with fertility drugs.
There are two types of twins -- monozygotic ("identical") from a single egg, and dizygotic (fraternal) from two eggs. Only dizygotic twins can have a different sex.