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HeroicJay
Current Version
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As for blonds and redheads, it is true that (if we assume one gene and complete dominance of dark hair; human hair color is more complicated than that) a blond(e) or redhead mating with a \'\'homozygous\'\' brunet(te) will always produce dark-haired children, but it\'s not like those lighter-haired genes disappear into the aether. A recessive gene is one that simply isn\'t expressed unless you have two, and you inherit one from each parent. A dark-haired person could easily be carrying blond/redhead genes, just without expressing them. And if they pass those genes to their children, it\'s very possible that their children could wind up with those lighter hair colors. Actually, it\'s \'\'harder\'\' to permanently stamp out recessive traits than dominant traits, since it\'s impossible to know who has the recessive genes but isn\'t expressing them except by looking at their relatives (this is why most widespread inherited genetic disorders, especially ones that are fatal in the host\'s early life, are recessive.)
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As for blonds and redheads, it is true that (if we assume one gene and complete dominance of dark hair; human hair color is more complicated than that) a blond(e) or redhead mating with a \\\'\\\'homozygous\\\'\\\' brunet(te) will always produce dark-haired children, but it\\\'s not like those lighter-haired genes disappear into the aether. A recessive gene is one that simply isn\\\'t expressed unless you have two, and you inherit one from each parent. A dark-haired person could easily be carrying blond/redhead genes, just without expressing them. And if they pass those genes to their children, it\\\'s very possible that their children could wind up with those lighter hair colors. Actually, it\\\'s \\\'\\\'harder\\\'\\\' to permanently stamp out recessive traits than dominant traits, since it\\\'s impossible to know who has the recessive genes but isn\\\'t expressing them except by looking at their relatives (this is why most widespread inherited genetic disorders, especially ones that are fatal in the host\\\'s early life, are recessive.) And with no significant pressure against blond or red hair, it\\\'s not likely to disappear in the foreseeable future.
