The diagram shows a Punnett square made to predict the earlobe shape of the offspring of two parents. The capital A stands for the trait of free-hanging earlobes (unattached), and the lowercase a stands for the trait of attached earlobes.
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Explanation:
AA
free-hanging earlobes
Aa
free-hanging earlobes
Aa
free-hanging earlobes
aa
attached earlobes
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