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Archiver > DNA-NEWBIE > 2008-09 > 1222035207


From: "Valorie Zimmerman" <>
Subject: Re: [DNA-NEWBIE] mtdna is not a sex chromosome...
Date: Sun, 21 Sep 2008 15:13:27 -0700
References: <c58.2c813baa.36081c7e@aol.com><BAY140-W1A6F737464B15F68A37E1E4480@phx.gbl>
In-Reply-To: <BAY140-W1A6F737464B15F68A37E1E4480@phx.gbl>


Sex-linked simply means that traits follow gender. One example would
be male-pattern baldness, which only men suffer. It's a general term,
and is normally not used to discuss the cellular level biology.

Valorie


On Sun, Sep 21, 2008 at 3:08 PM, Nelda Percival
<> wrote:
>
> Joan,
> If you would say one is a sex chromosome (THE Y) and one is sex-linked (THE MTDNA) then we agree.. MTDNA is the power generator of all cells, it is not linked to the generation of a particular sex. It is only passed by the egg... is the only reason you can indicate it is sex-linked. Sometimes the mtdna in the sperm actually enters the egg cell, but because of the over abundance of the mtdna in the egg and the small amount left in the sperm, it does not survive... THe primary amount of the mtdna in sperm is in the tail, which falls away when the head enters the egg cell.
>
> Nelda

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