There are two kinds of twins. “Fraternal” or
non-identical twins have DNA as different as any
two people with the same parent. They may be the
same sex or opposite sex. They may be a bit more
alike than other siblings just because they grow
up at the same time.
Identical twins have the same DNA (mostly).
They are formed when one tiny embryo splits in
two. That does not mean that the twins are really
identical. Their environment is different
starting off before they are even born. One twin
may get more blood supply, for example. After
they are born, they may have different experiences
and make different choices.
There may be some differences in some of their
DNA because mutations can happen at any time. So
even though their DNA starts off identical, some
of their cells may have slightly different DNA,
you just wouldn’t know it by looking at them.
If you are interested in DNA, you may want to
become a geneticist.
Thanks for asking,
There are two types of twins: identical and
fraternal. Identical twins, or monozygotic, come
from one zygote that splits to form two embryos.
Fraternal twins, or dizygotic, are a product of
two separate eggs being fertilized. Identical
twins are usually both boys, or both girls, but
fraternal twins can be both boys, both girls, or
even a boy and a girl. Identical twins, since they
are split into two from the same zygote, can have
the same DNA. The DNA isn't perfectly identical,
but it's pretty similar. They look almost exactly
the same, but each twin develops and lives their
life separates so they are exact mirror images of
each other. Fraternal twins, obviously, would have
a greater difference in DNA because they are
already to completely separate eggs that are being
fertilized to become two completely separate
babies. So, basically identical twins have
"similar" DNA and fraternal twins do not.
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