This topic is close to my heart, as I placed my son for adoption 5 years ago. I was very eager to learn more about this phenomenon after we spoke about it in class and dove right in to compare any similarities or dissimilarities with my personal situation. Adoption studies can be an integral part of learning more about nature versus nurture and my real life example will put this theory to the test.
An interesting turn of events is that Jack (my son) turned out to look very similar to his adoptive parents, almost more than me which is quite odd. His adoptive father and him will be in the supermarket and people will stop them to complement how much they look alike (it must be the blond hair and blue eyes). This could be a coincidence or a product of his environment affecting how he looks. I am not the only person who thinks that there is some sort of correlation with biological and environmental factors.