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Segal discusses the biologic basis of twinning along with unusual types of "twins," such as unrelated siblings of the same age who are reared together through adoption, and complicated sibling relationships, such as those that can result from modern fertility treatments involving sperm or egg donation or surrogate motherhood. For example, there are twins who had different intrauterine environments because they were carried by different surrogate mothers and, in rare cases, fraternal twins with different fathers. This book deals imaginatively with the ways in which such sibling relationships challenge our notion of twinning and offer new angles for the study of genetic and environmental influences on behavior. Identical twins reared apart offer a rare opportunity to examine similarities between persons who are genetically identical but do not share a common environment; such work is eloquently described and illustrated with fascinating cases. The importance of differences between the members of separated pairs is also highlighted, since these differences tell us as much about environmental influences on behavior as they do about genetic influences.
There are interesting chapters on what twin studies can tell us about athleticism, intelligence, personality, and mental disorders, but because the emphasis here is on behavior (as the title of the book suggests), a detailed review of studies of mental disorders in twins is outside its scope. For anyone interested in twin research, this book will provide a wealth of information illustrated with real-life examples and written in an understandable, readable style. Its wide-ranging and up-to-date content makes it a valuable review of all aspects of twin research.
Reviewed by Jane Scourfield, M.R.C.Psych.
Copyright © 2000 Massachusetts Medical Society. All rights reserved. The New England Journal of Medicine is a registered trademark of the MMS.
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