Natural cloning-Identical twins
Cloning is not always man made. Cloning can be a natural process. Identical twins are an example of how clones do not always start in a test tube. Single celled organisms like yeast and mould also can clone naturally. Cloning is a common practice in many organisms. In humans, identical twins are a form of cloning.
Identical twins do not have to look alike. The word identical in this term refers to how the twins are formed, not how they look. The proper term for identical twins is, monozygotic. Monozygotic twins form from a single fertilized egg. The zygote splits into two parts after conception, resulting in the development of two individual embryos. The individual embryos come from the same egg, this means that they have the same genetic origins. They have the same DNA.
Even though identical twins have the same DNA, it can be expressed in different ways. The environment (in the womb and out of the womb) that the twins are exposed to can change their apperances. This means that identical twins can have different fingerprints. Usually their fingerprints are very similar though. Also, as identical twins get older differences generally develop.
The chance of having an identical twin is about 1 in every 250, or 0.4%. It is unknown as to why a fertilized egg splits to give birth to identical twins. Identical twins do not run in families, having identical twins is often considered hereditary, but it is not. There is no known way to have an identical twin.
Identical twins are usually of the same gender. This is because they form from a single zygote that contains either male (XY) or female (XX) chromosomes. Monozygotic means that the twins form from a divided fertilized egg. It starts as one and splits into two. When it splits it is either male of female, this results in identical twins being of the same gender. There are some cases in which identical twins are different genders. This is because the girl twin has Turner Syndrome. This means that there were problems when the egg split and the girl who was meant to be a female ended up with one X chromosome and no Y.
Identical twins do not have to look alike. The word identical in this term refers to how the twins are formed, not how they look. The proper term for identical twins is, monozygotic. Monozygotic twins form from a single fertilized egg. The zygote splits into two parts after conception, resulting in the development of two individual embryos. The individual embryos come from the same egg, this means that they have the same genetic origins. They have the same DNA.
Even though identical twins have the same DNA, it can be expressed in different ways. The environment (in the womb and out of the womb) that the twins are exposed to can change their apperances. This means that identical twins can have different fingerprints. Usually their fingerprints are very similar though. Also, as identical twins get older differences generally develop.
The chance of having an identical twin is about 1 in every 250, or 0.4%. It is unknown as to why a fertilized egg splits to give birth to identical twins. Identical twins do not run in families, having identical twins is often considered hereditary, but it is not. There is no known way to have an identical twin.
Identical twins are usually of the same gender. This is because they form from a single zygote that contains either male (XY) or female (XX) chromosomes. Monozygotic means that the twins form from a divided fertilized egg. It starts as one and splits into two. When it splits it is either male of female, this results in identical twins being of the same gender. There are some cases in which identical twins are different genders. This is because the girl twin has Turner Syndrome. This means that there were problems when the egg split and the girl who was meant to be a female ended up with one X chromosome and no Y.
The picture illustrates how humans can be naturally cloned.