You thought you knew all the ways to make a baby.
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Sources:
https://ghr.nlm.nih.gov/primer/basics/mtdna
http://www.sciencedirect.com/science/article/pii/S0167488913001092
http://science.sciencemag.org/content/276/5319/1687
http://discovermagazine.com/2013/march/14-interbreeding-neanderthals
http://www.nature.com/scitable/topicpage/mtdna-and-mitochondrial-diseases-903#
http://www.npr.org/sections/health-shots/2016/05/04/476539552/advance-in-human-embryo-research-rekindles-ethical-debate
http://www.geneticsandsociety.org/article.php?id=6527#3
https://www.newscientist.com/article/2096401-three-parent-babies-might-have-health-problems-in-later-life/
Image Sources:
https://commons.wikimedia.org/wiki/File:UCSC_human_chromosome_colours.png
https://commons.wikimedia.org/wiki/File:Mitochondrion_mini.svg
https://commons.wikimedia.org/wiki/File:Mitochondrial_DNA_blank.svg
https://commons.wikimedia.org/wiki/File:Canis_lupus_howling_on_glacial_erratic.jpg
https://commons.wikimedia.org/wiki/File:Homo_sapiens_neanderthalensis.jpg
https://commons.wikimedia.org/wiki/File:Mitochondria,_mammalian_lung_-_TEM.jpg