Word: geneses
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It's natural to try to find something to blame--fast-food joints or food manufacturers or even ourselves for having too little willpower. But the ultimate reason for obesity may be rooted deep within our genes. Obedient to the inexorable laws of evolution, the human race adapted over millions...
For the moment, Kaguya's creation is a brilliant piece of science with little or no application to humans. The process by which she was produced is so technically difficult--not to mention ethically charged--that it is hard to see how it could be attempted with human subjects. In...
The answer, most scientists suspect, has to do with a peculiar process called parental or genomic imprinting, which seems to occur only in mammals. Biologists have discovered subtle changes that are made to about 100 genes and that make a mammalian DNA molecule distinctly male or female. How does a...
All other things being equal, an embryo must have both a maternal genomic imprint (usually from an egg) and a paternal genomic imprint (usually from a sperm), or it won't grow properly. If it has two paternal imprints, the placenta grows but not the embryo. If it has two...
But scientists now have a better understanding of the biological underpinnings of procreation. "In spite of all the differences between men and women--our fights, arguments and seeming incompatibility--at the end of the day you still need a set of male and female genes for the species to go...