❓ why
Why do babies usually inherit mitochondria from their mother?
Human BiologyInheritance
Quick Answer
Because the egg supplies nearly all the cytoplasm and organelles to the embryo, while sperm mitochondria are usually destroyed after fertilization. That makes mitochondrial DNA mostly maternal.
The Full Story
When fertilization happens, the egg is much larger than the sperm and provides almost all of the embryo’s cytoplasm, including its mitochondria. Sperm mitochondria are concentrated in the tail to power swimming, but they usually do not persist in the embryo. Cells also have mechanisms that mark paternal mitochondria for breakdown after fertilization. This is why mitochondrial DNA is a powerful tool in genealogy and population genetics.
Key Facts
1.Mitochondrial DNA is usually inherited maternally
2.Sperm mitochondria power motility in the tail
3.Maternal inheritance helps geneticists trace lineages
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Suggested video title for this topic:
"Why does mom pass on your mitochondria, not dad?"