Which of the following is the origin of the mitochondrial DNA of all human adult cells?
The mitochondrial DNA of all human adult cells is of maternal origin only. In human feilization, the entire sperm enters the secondary oocyte cytoplasm. However, sperm mitochondria degenerate along with the sperm's tail. Therefore, only mitochondria present within the secondary oocyte (maternal) remain in the feilized zygote.
Paternal only
Maternal only
A combination of paternal and maternal
Either paternal or maternal
Introduction and gametogenesis.