Mitochondrial inheritance

I remember seeing this on an frq; why is it that heterozygotes are uncommon with mitochondrial inheritance?

There is only mom’s allels being passed down so variation doesn’t happen you just have moms alleles so you get what she has I think

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mitochondria comes from your mom because the sperm uses all of their energy when trying to get to the egg cell they have to travel a far distance…that is what I would say

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