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marked as duplicate by WYSIWYG, Christiaan, Chris, terdon, HDE 226868 Mar 4 '15 at 16:53

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

I posed a similar question a while back. You might want to check it out, even if the answer is inconclusive... – single_digit May 6 '13 at 13:12

It depends what you mean by "predict". Consider that the faces on genetically identical individuals, such as identical twins, are very similar, even in old age. If you look at the processes of development over the life of an individual as a more-or-less deterministic and predictable phenomenon, then you might argue that faces are predictable from DNA info. The fact that no one has ever done this from first principles is another issue - in principle it is possible.

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So you are saying it is possible to analyze someone's DNA and determine approximately what their face will look like? – L.B. Mar 4 '15 at 1:44
I'm saying that if "nature" can reliably produce similar-looking faces from similar DNA, then there is an underlying mechanism operating which is accessible to scientific investigation, possibly leading to a technology of predicting facial features by examining a person's genome. But not yet. – jalegris Mar 4 '15 at 2:24
That's cool. It would/will be interesting to see what comes of that in the coming years. Thank you for sharing :) – L.B. Mar 4 '15 at 3:29

Not accurately. Assuming the DNA information is the DNA sequence, you can't tell which genes are being expressed and which are being silenced. These are through chemical groups on the DNA which aren't generally picked up.

Also there's the environment that grossly affects what you look like, how much you weigh, your skin colour and cosmetic surgery.

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Just for added clarity, the chemical modifications I referred to were epigenetic mechanisms of methylation and histone acetylation etc. – AndroidPenguin May 10 '13 at 23:30
Just saying grossly means net-gain. It's used when describing things like financial matters, and really doesn't make sense here..unless you mean they've had some sort of terrible accident :P – Starkers Mar 15 '14 at 12:43
@Starkers in medical terms it means that which is visible to the naked eye. It also is used for financial matters. It's a homonym. – AndroidPenguin Mar 15 '14 at 13:45
@Starkers Gross Anatomy... It's probably not a bad idea to assume someone knows something you don't until you can prove them incorrect. – anongoodnurse Mar 4 '15 at 1:28

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