"It’s not clear why mtDNA prefers being exclusively maternal" Wait... I thought that the reason mtDNA came from your mother is that the egg from your mother fo

"It’s not clear why mtDNA prefers being exclusively maternal" Wait... I thought that the reason mtDNA came from your mother is that the egg from your mother forms your first cell and the sperm only delivers DNA into the nucleus. They cytoplasm all comes from your mother. In that cytoplasm swims your mother's mitochondria. I assumed when I started reading this article that maybe somehow mitochondria from the sperm sneaks out into the cytoplasm of your initial cell. Is that understanding not correct?