A gene that affects shell$-$coiling direction in snails is a maternal effect gene. The gene exists as a dominant allele D and a recessive allele d$.$ A female snail with a right$-$coiling shell is mated to a true breeding male with a left$-$coiling shell $($dd$).$ All of the offspring have left$-$coiling shells.

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What is the genotype of the female snail?

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What is the genotype of the offspring?

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What is the genotype of the female snail's mother?

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