7. The donor egg only contributes a tiny percentage of DNA.
The child resulting from 3-parent fertilization will be genetically closer to the mother and father rather than the donor. The BBC explains: “There is 1.05 meters of DNA in the nucleus and 0.0054 mm of DNA in our mitochondria. Let’s put that another way. If you imagine the DNA in your nucleus—remember this is all the important stuff which makes us what we are—and stretched it from Trafalgar Square to Prof Turnbull’s laboratory in Newcastle, you’d have a double helix of 282 miles.” Remember the nucleus comes from the mother while the mitochondria comes from the donor.
