Fused ear lobes appear En the progeny due to an autosomal recessive gene. Work out the genotypes of members in the given pedigree.

I-2-aa, II-3-Aa, III-1-Aa

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I-2-aa, II-3-AA, III-1-AA

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I-2-Aa, II-3-Aa, III-1-Aa

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I-2-aa, II-3-Aa, III-1-AA

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Solution

The correct option is B I-2-aa, II-3-Aa, III-1-Aa
Given pedigree chart for fused ear lobes (autosomal recessive trait) can be explained as follows

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