In a cross of Lymnaea, the snail contributing the eggs was dextralbut of unknown genotype. Both the genotype and the phenotypeof the other snail are unknown. All F1 offspring exhibited dextralcoiling. Ten of the F1 snails were allowed to undergo self-fertilization.One-half produced only dextrally coiled offspring, whereasthe other half produced only sinistrally coiled offspring. Whatwere the genotypes of the original parents?

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