The Allele D Codes for Right-Handed Coiling in a Species

Multiple Choice

The allele D codes for right-handed coiling in a species of snail,while allele d codes for left-handed coiling.Assuming the proteins encoded by these two alleles are cytoplasmic determinants,if a dd female mates with a DD male,what percentage of offspring snails will develop shells that are left-handed coils?

A) 0%
B) 25%
C) 50%
D) 75%
E) 100%