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Striking Similarities

Striking Similarities. Critically evaluate those similarity findings in research studies on twins . Handout 3-2. Twin and Adoption Studies. Studying the effects of heredity and environment on two sets of twins, identical and fraternal, has come in handy. Separated Twins.

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Striking Similarities

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  1. Striking Similarities Critically evaluate those similarity findings in research studies on twins

  2. Handout 3-2

  3. Twin and Adoption Studies Studying the effects of heredity and environment on two sets of twins, identical and fraternal, has come in handy.

  4. Separated Twins A number of studies compared identical twins reared separately from birth, or close thereafter, and found numerous similarities.

  5. Separated Twins Critics of separated twin studies note that such similarities can be found between strangers. Researchers point out that differences between fraternal twins are greater than identical twins. Bob Sacha

  6. Biological Versus Adoptive Relatives Adoption studies, as opposed to twin studies, suggest that adoptees (who may be biologically unrelated) tend to be different from their adoptive parents and siblings.

  7. Adoptive Studies Adoptive studies strongly point to the simple fact that biologically related children turn out to be different in a family. So investigators ask: Do siblings have differing experiences? Do siblings, despite sharing half of their genes, have different combinations of the other half of their genes? Ultimate question: Does parenting have an effect?

  8. Temperament and Heredity Temperament refers to a person’s stable emotional reactivity and intensity. Identical twins express similar temperaments, suggesting heredity predisposes temperament.

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