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11-18-2012, 02:34 PM
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Originally Posted by PSUCapsFan View Post
Aren't the mitochondria in our cells originally a foreign species with there own unique genome?
Originally Posted by AfroThunder396 View Post
That's the theory. Chloroplasts in plant cells too.

Both have their own DNA and membranes, we assume they were originally free-floating prokaryotes.

To add to AfroThunder's post, mitochondria are passed along in the mother's ovum as discrete units, which means it's separate from the 23 chromosomes you get from each parent. Once cell division commences, the mitochondria are simply passed along in every cell.

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