Results are out! Find what you need...fast. Get quick advice or join the chat
Hey there Sign in to join this conversationNew here? Join for free

Question about mitochondrial DNA?

Announcements Posted on
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    If mitochondrial DNA is only inherited from the mother (as the sperm cell's mitochondria is in its tail which does not fuse with the egg cell at fertilisation) does that mean that everyone's mitochondrial DNA is exactly the same? And the same as the first woman that ever existed?
    • 1 follower
    Offline

    ReputationRep:
    Well I'm not a genetics expert but I know a little bit about mitochondrial DNA from A level Bio. Enough to make an educated guess.

    First, if there was only 1 woman who started the human race then yes we'd all have identical mitochondrial DNA (aside from mutations from things like radiation over the years.) But there wasn't. That's creationism. Which is totally untrue in the real world.

    There is a theory that our mitochondria are present from a symbiosis between ancient bacteria and cells. A sort of fusion that benefits both. And we didn't all get mitochondria from one single bacterial cell.

    So no, we don't all have the same mitochondrial DNA. Otherwise any disease caused by mitochondrial genetics would be present in every human on earth.
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    Ohh I see...so people within the same family would all have the same mitochondrial DNA
    • 1 follower
    Offline

    ReputationRep:
    (Original post by Bonjour)
    Ohh I see...so people within the same family would all have the same mitochondrial DNA
    Well if its a mitochondrial disease then the mother would pass it on to all of her children because all of the children have her mitochondria.

    The father could be affected or unaffected, depending on his parents.

    So in a way, yes
    • Thread Starter
    • 0 followers
    Offline

    ReputationRep:
    Cool.. thanks lol :]
    • 69 followers
    Offline

    ReputationRep:
    (Original post by Bonjour)
    If mitochondrial DNA is only inherited from the mother (as the sperm cell's mitochondria is in its tail which does not fuse with the egg cell at fertilisation) does that mean that everyone's mitochondrial DNA is exactly the same? And the same as the first woman that ever existed?
    Not quite, however this may be of interest:

    http://en.wikipedia.org/wiki/Mitochondrial_Eve

Reply

Submit reply

Register

Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: April 18, 2012
New on TSR

Find out what year 11 is like

Going into year 11? Students who did it last year share what to expect.

Article updates
Reputation gems:
You get these gems as you gain rep from other members for making good contributions and giving helpful advice.