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Because they are only truly identical after their cells first split into two embryos. After that, they will begin to divide independently of each other (using the same instructions from DNA). Since cell division is complex, they will not divide identically, which will make subtle changes in their construction. Since they are using the same instructions for cell division (from DNA) they will look remarkably similar, but not truly identical.
What else can I help you with?
Are identical twins always the same size and birth weight?
Identical twins may not always be the same size and birth weight. Factors such as position in the womb, nutrition, and other environmental influences can lead to differences in size and weight at birth.
Do identical twins have the same pattern of epidermal ridges?
Identical twins do not have the exact same pattern of epidermal ridges on their fingertips. While they share the same genetic makeup, there are certain environmental factors that can influence the development of these ridges, resulting in slight differences between twins.
Why must any differences between identical twins be controlled only by the environment?
Identical twins have the same DNA - meaning that without the effects of environment they would be identical in every single way.
Which kind of twins are identical or non-identical are more like two children born at different times?
Non-identical twins are more like normal siblings. Identical twins have the exact same DNA, so will be very similar in appearance. Their environment will cause them to have very slight differences, such as different fingerprints and freckles.
Is there a word for twins who don't look alike?
Yes, non-identical twins are often referred to as fraternal twins. These twins develop from two separate eggs fertilized by two different sperm cells, resulting in genetic differences that can make them look less alike than identical twins.
Are twins in the same placenta genetically identical"?
No, twins in the same placenta are not genetically identical. While identical twins share the same DNA, they may have slight genetic differences due to mutations that occur after fertilization.
Are identical twins always the same size and birth weight?
Identical twins may not always be the same size and birth weight. Factors such as position in the womb, nutrition, and other environmental influences can lead to differences in size and weight at birth.
If an identical twin marries an identical twin what is the likelihood of them having twins?
the statistics of twins marrying twins having twin children is only a slight fractional increase in percentage of chance. it is almost negligable however the slight increase has lead many people to believe the common misconseption of twim marraige resulting in the birth of more twins alot.
Why are there differences between identical twins?
Although Identical twins look the same and share the same DNA, there are some differences between the two do to there environment and way of life as they develop. However, one way to distinguish between the twins from birth would only be by their finger prints. In other words, identical twins finger prints are different from birth because of there movements within the mothers womb and what they are touching within her womb before they are born.
Do identical twins have the same pattern of epidermal ridges?
Identical twins do not have the exact same pattern of epidermal ridges on their fingertips. While they share the same genetic makeup, there are certain environmental factors that can influence the development of these ridges, resulting in slight differences between twins.
Is the DNA in twins the same?
Twins can have very similar DNA, especially in identical twins who come from a single fertilized egg that splits into two. On the other hand, fraternal twins are no more similar genetically than any other siblings. Some slight genetic differences can arise due to mutations that happen after the initial egg fertilization.
Why must any differences between identical twins be controlled only by the environment?
Identical twins have the same DNA - meaning that without the effects of environment they would be identical in every single way.
What are fraternal twins?
Fraternal twins are two siblings that have the same birth day, but do not look identical.
Which kind of twins are identical or non-identical are more like two children born at different times?
Non-identical twins are more like normal siblings. Identical twins have the exact same DNA, so will be very similar in appearance. Their environment will cause them to have very slight differences, such as different fingerprints and freckles.
What are the chances of identical twins having twins themselves?
Women who are themselves fraternal twins have a 10% chance of producing twins, identical twin women have only a 0.6% probability of having a twin birth.
What is the Differences between identical and nonidentical twins?
Identical twins are born together, and look exactly alike.Nonidentical twins are born together, but do not look exactly alike.A good example of non identical would be boy and girl twins,
Is there a word for twins who don't look alike?
Yes, non-identical twins are often referred to as fraternal twins. These twins develop from two separate eggs fertilized by two different sperm cells, resulting in genetic differences that can make them look less alike than identical twins.
