Here's why:
* Mitochondrial DNA is located in the mitochondria, which are organelles within cells responsible for energy production.
* Maternal inheritance: Sperm cells contribute very little to the cytoplasm of a fertilized egg. Therefore, mtDNA is almost exclusively inherited from the mother.
* Both sexes inherit mtDNA: Both sons and daughters receive mtDNA from their mothers. However, only daughters can pass on their mtDNA to their own children.
To summarize:
* Sons: Receive Y-chromosome from their father and mtDNA from their mother.
* Daughters: Receive X-chromosome from both parents and mtDNA from their mother.
This pattern of inheritance makes mtDNA a valuable tool for tracing ancestry and studying evolution.
