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The special relationship between twins allows researchers to examine the differences between genetic and environmental influences over both physical and mental health, as well as traits and ...
twin, either of two young who are simultaneously born from one mother. Twinning, common in many animals, is of two biological kinds: the one-egg (monozygotic), or identical, type and the two-egg (dizygotic), or fraternal, type. The latter type is more usual and can be thought of simply as a litter of two. In humans, psychological studies of sets of identical twins, since they are genetically ...
More types of twins exist than previously thought. Beyond identical and fraternal, there's a rare third type. Twin pregnancies have unique risks and outlooks.
Fraternal and identical are the most common types of twins. Other types include conjoined twins, half-identical twins and others.
The meaning of TWIN is either of two offspring produced in the same pregnancy. How to use twin in a sentence.
These two twin girls are identical, or monozygotic, twins. The prefix βmono-β means βone.β Twins are named as such because they arise from one zygote. Even though these twins share mostly the same DNA, they tend to look a little different from each other because they have different lives. Image by Favourdare123 via Wikimedia Commons.