The introduction of blond hair and blue eyes into the dark-haired, dark-eyed Japanese gene pool through marriage and reproduction is an example of gene flow. Gene flow refers to the transfer of genetic material between populations through immigration, emigration, or breeding, leading to gene mixing.
A blond blue-eyed person moves to japan and marries a native japanese person. The introduction of the blond hair, blue-eyed genes into the dark haired, dark eyed japanese gene pool an example of:
mate selection
mutation
gene flow
natural selection
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