Acertain kind of snail can have a right-handed direction of shell coiling (dd or dd) or left-handed coiling (dd). however, 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 certain kind of snail can have a right-handed direction of shell coiling (DD or Dd) or left-handed coiling (dd). However, 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. all Dd; half right-coiling and half left-coiling

B. all Dd; all right-coiling

C. 1/2 Dd:1/2 dd; all right-coiling

D. 1/2 Dd:1/2 dd; half right-coiling and half left-coiling

D. 1/2 Dd:1/2 dd; half right-coiling and half left-coiling

Explanation:

right-handed direction of shell coiling (DD or Dd)

left-handed coiling (dd)

If a Dd egg-producing snail and a dd sperm-producing snail breeds together, we will have the following type of offspring

Dd × dd = ( Dd, Dd, dd, dd )

Genotype = 2/4 =1/2 (Dd, dd)

Phenotype = 2/4 =1/2  (Dd, dd)

Thus , option D is the right answer , (1/2 Dd:1/2 dd; half right-coiling and half left-coiling)

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