The moon has nothing to do with the sex of a chicken that comes out of the egg. Farmers' wives may still think so, but biologists know better. It is a chromosome that does the business, whether the offspring is a fruit fly's or a man's. To predetermine sex, control the chromosome. In the Journal of Heredity, organ of the American Genetic Association, Princeton Biologist E. Newton Harvey has a way.
In the repoduction of mammals, roughly half of a male's sperm contains X chromosomes which produce female offspring, and half contains Y chromosomes, producing...
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