A Certain Kind of Snail Can Have a Right-Handed Direction

question 40

Multiple Choice

A certain kind of snail can have a right-handed direction of shell coiling (D) or left handed coiling (d) . If direction of coiling is due to a protein deposited by the mother in the egg cytoplasm, then a Dd egg-producing snail and a dd sperm-producing snail will have offspring of which genotype(s) and phenotype(s) ?

• A)1/2 Dd : 1/2 dd; all right coiling
• B)All Dd; all right coiling
• C)1/2 Dd : 1/2 dd; half right and half left coiling
• D)All Dd; all left coiling
• E)All Dd; half right and half left coiling

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