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One twin, the 'donor' twin, is small and anemic, the other, the 'recipient' twin, is large and polycythemic The lives of both twins are endangered by this condition. The meaning of twin is either of two offspring produced in the same pregnancy How to use twin in a sentence. In a basic twin pregnancy, two embryos go their separate ways and develop into twin babies, whether identical or fraternal Some unique sets of twins follow a different path. There are different types of twins, identical and fraternal being the most common Identical, or monozygotic, twins develop from the same fertilized egg that splits into two Either of two children born to the same mother on the same occasion One of two very similar… The question was, if one twin has the condition, does the other twin have it, too By comparing the rates between identical and nonidentical twins, researchers could try to. Twin, either of two young who are simultaneously born from one mother Twinning, common in many animals, is of two biological kinds Learn how twinning happens and what types of twins are out there. Being two or one of two offspring born at the same birth Being two or one of two identical or similar people, animals, or things