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The absence of dimples in your friend's younger sister could be attributed to genetic variation. Dimples are often considered a dominant trait, meaning that if both parents carry the gene for dimples, their children are likely to inherit them. However, it's also possible for a recessive gene to manifest, leading to the sister being the only one without dimples, despite her family's history. Environmental factors or random mutations may also play a role in this unique characteristic.

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1d ago

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