FranklinMichaelV.3
Well-Known Member
Oh. See. I can learn something new every day. :bow:
I only said In humans because I don't know how mitochondria functions in terms of being passed along like in other animals. I should be corrected though, the mitochondrial cells found in the human sperm are actually destroyed in the embryo.
Here's a clearer explanation
An individual's mitochondrial genes are not inherited by the same mechanism as nuclear genes. Typically, the mitochondria are inherited from one parent only. In humans, when an egg cell is fertilized by a sperm, the egg nucleus and sperm nucleus each contribute equally to the genetic makeup of the zygote nucleus. In contrast, the mitochondria, and therefore the mitochondrial DNA, usually come from the egg only. The sperm's mitochondria enter the egg but do not contribute genetic information to the embryo.[101] Instead, paternal mitochondria are marked with ubiquitin to select them for later destruction inside the embryo.[102] The egg cell contains relatively few mitochondria, but it is these mitochondria that survive and divide to populate the cells of the adult organism. Mitochondria are, therefore, in most cases inherited only from mothers, a pattern known as maternal inheritance. This mode is seen in most organisms including the majority of animals. However, mitochondria in some species can sometimes be inherited paternally. This is the norm among certain coniferous plants, although not in pine trees and yew trees.[103] For Mytilidae mussels paternal inheritance only occurs within males of the species.[104][105][106] It has been suggested that it occurs at a very low level in humans.[107] There is a recent suggestion mitochondria that shorten male lifespan stay in the system because mitochondria are inherited only through the mother. By contrast natural selection weeds out mitochondria that reduce female survival as such mitochondria are less likely to be passed on to the next generation. Therefore it is suggested human females and female animals tend to live longer than males. The authors claim this is a partial explanation.[108]