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Why are non-identical twins genetically different but identical twins genetically the same?
Identical twins come from the same egg and sperm so they have all the same DNA. When the egg is fertilized it starts splitting to form new cells which is how the embryo grows. Sometimes when the egg splits it comes totally apart creating two embryos with one cell instead of one embryo with two cells. Both of these grown into fully formed babies but since they share all the same DNA they look identical. Fraternal (non-identical) twins are from two different eggs and two different sperm. When a woman ovulates (releases an egg) she usually releases just one. Sometimes she will release two (or more) at the same time and if they both get fertilized then two babies will be born. These two babies are not any more closely related genetically than any other brothers and sisters are.
A zygote that separates into two clusters of cells insted of just one prduce?
Non identical twins.
Two brothers Josh and Ben look exactly alike and are exactly the same age yet they are not twins How is this possible?
By definition two children born to the same mother at the same time would be twins. It would be possible that they would not be twins if they were only half brothers, meaning that they shared a father but were born to two different mothers at the same time, or where they shared the same mother and father, but one was carried and born to a surrogate, or both by two separate surrogates and just happened to look very simmilar, though they would share different DNA. If they did share the exact same DNA and also were not twins one would have to be the 'clone' or the other, meaning that a single embryo was 'conceived' from one sperm and one egg, which was cloned, and each embryo was implanted into a different woman's womb, and were born at the exact same time. They could just be dogs or another animal that is born in a liter. They're brothers and look exactly the same, but aren't neccesarily twins.
What is the genetic difference between identical and non identical twins?
Identical twins are formed by the separation of the same embryo containing same genetic coding. thus the the twins are identical as formed from the same embryo. But this is not the case in the non-identical twins as they are formed from the individual embro each having different genetic coding.
How are non identicle twins made?
Non-identical twins are formed only when there are two or more separate egg cells produced by the ovary, they will remain in the fallopian tube until fertilized by a sperm cell or when menstruation occurs
Can conjoined twins be male and female?
No. Conjoined twins are always identical twins, and never just fraternal twins. Identical twins come from a single embryo that splits. In the case of conjoined twins, a complete split never occurs. So when they come from the same embryo, they are always the same gender.
Did King Tutankhamun's wife have babies?
yes twins infact, they died just after birth
How are sets of identical twins made?
Identical twins, or monozygotic twins are formed from one zygote. This is usually a result of damage to the embryo that causes it to split into two. If both halves are big enough to survive and the split has happened early enough on then two badies sharing one amniotic sac, one placenta and the same DNA will be born.
Do miscarriages happen in twins?
Yes, my sister just had a miscarriage and she was carrying twins. But one of the babies survived. If they are identical, then neither will survive, but otherwise one will
How much babies do dolphins have at ones?
Just one, there have been cases of twins but it's not a very high percentage. Usually just one
How many babies does a koala give birth to at one time?
Koalas usually have just one baby at a time, but twins are not unknown.
How many babies dose an elk have?
Two, but usually one.
How many babies can a llamas have?
Both llamas and alpacas only have one baby, also called a cria. They are like horses in which that 99.9% of the time they only have one baby, but in rare cases, like horses, they may have twins, but often one or both of the twins dies and possibly the mother. But I have seen here on the internet one set of twins where the mother and the babies all lived and the babies are growing up just fine.
How many babies cows can be born every times a cow pregnant?
Usually just one. Twins can be born, just not as common.
How many babies do the koalas have for each pregnancy?
Koalas usually produce just a single offspring each pregnancy. Twins are very rare.
How many babys does a goat have?
They usually have twins, but there can be just one or even three or four babies. So 1-4.
How are twins produced?
identical twins are formed when one sperm fertilizes a single ovum and the zygote divides into two in the initial stages of cleavage of the zygote. then, the two parts of the same zygote develop independently. fraternal wins are formed when two sperms fertilize two different ova.
