Unfortunately he was unable to find enough data to support his theory that blonde hair is sexually selected and had to drop the subject. Sex Roles Journal; 29 : This is because postmenopausal women rarely retain the flaxen locks of their youth, of course eventually becoming grey grannies. The genes for blue eyes and blonde hair are recessive, meaning both parents must have the genes for them to be expressed in their offspring. It has been theorised that the blonde hair and blue eyes seen in Caucasians are recent adaptations, dating from approximately 11, years ago. Blondes do not seem to have lost any of their popularity since the end of the last ice age.
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