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%

Question

Quizplus · Accepted Answer

The dd female will only produce d gametes, while the DD male will only produce D gametes. All of the offspring will be Dd, and since the D allele is dominant, all of the offspring will have right-handed coils.

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