|MadSci Network: Genetics|
Hi Jessica! The answer to your question is that, in addition to genetics, there are also other factors involved in creating our adult voice. These include hormones (particularly at puberty); the influence of external factors (particularly smoking); and the range of sounds we hear and produce (particularly shouting or singing). Now, the genetics in identical twins are the same, but the hormones (even in the womb) are NOT! That explains why identical twins may be both right and left handed; have different fingerprints and may well have different skills and seek different careers. A much better and more detailed answer to this question is already on Madsci here: http://www.madsci.org/posts/archives/2006-02/1139766670.Ge.r.html I hope that helps - the real answer to many of these questions is that there are complex interactions between our genes and our environment which we are only just beginning to unravel. Once we do, we may be some way to explaining why some smokers live to be 90, whilst most die much younger from lung or heart diseases and why some people have a genius for music, maths or art when their family history has no suggestion that these factors have appeared in their ancestry. Hope that helps a little! HD2
Try the links in the MadSci Library for more information on Genetics.