Snail shell coiling is determined by a MATERNAL EFFECT gene. Snail shells can have either a right-handed (dextral) coiling or a left-handed (sinistral) coiling. Dextral (D) is completely dominant to sinistral (d). Answer the following questions based
upon this information. A sinistral female snail named Eustacia has offspring that are all dextral.
What is the Eustacia's GENOTYPE?
A) Dd or dd B) DD or Dd C) DD D) Dd E) dd
Answer: D
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