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In the TV show Heroes we see several examples where peoples' families also have abilities.

  • Claire Bennet's mother could control fire, her father can fly
  • Peter's brother can fly
  • Matt's dad was also a telepath

Dr Suresh's work shows that these are genetic anomalies which give people their abilities.

If this is the case why (except in the case of Matt Parkman) are the same abilities not passed to children (like eye colour, hair and other genetic traits)? Why do parents frequently have one gift and a child another?

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except in the case of Matt Parkman. There are other examples: Sylar and his father both have the same power, and Claire's mother Meredith and her brother Flint both have the same power (except that his flames are blue). – Crow T Robot Oct 21 '14 at 21:50
up vote 4 down vote accepted

It appears to be random. Two of the show's writers, Joe Pokaski and Aron Coleite, discussed this in an interview. Here are some of the interesting snippets:

Q: Now, also along this genetics line, shouldn't Nathan's other kids (Claire's half-siblings) have powers? Or is that only guaranteed if both parents are powered?

A: In genetics, nothing is guaranteed. A random mix of traits. Gregor Mendel and all that. Do we have to have a biology lesson, too? Wasn't the boring physics lesson enough?

In a separate session with the same site, this exchange occurred:

Q: Claire's new classmate West can fly. This brings up an interesting question about the heroes - can two different people have identical powers? And going back to Neal's theory above, does this necessarily indicate a genetic link? Are Claire and the classmate going to end up being the Luke and Leia of "Heroes?"

A: First off, Ew. And no, similar powers do not mean a genetic link. We've seen that the existence of powers may be something passed on, but the powers themselves are a crapshoot of sorts...

So the writer's appear to be happen leaving it as random as to why certain abilities are and are not passed on.

If you're interested, this Wikipedia page has an awesome list showing all the families in the show where multiple people have powers.

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