Which of the following traits in humans you can easily study just by observing and making family charts?

Dimples

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Tongue rolling

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Ear lobes attachment

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All of the above

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Solution

The correct option is D All of the above
The characteristics of the human that can be studied just by observation and family chart are characters of physical appearance or muscle habits controlled by genetics. So, characters such as dimples, tongue muscle rolling, and earlobe attachment are expressions of genes which can be observed by making charts.
So, the correct answer is 'All of the above'.

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