Question

In snails, the shell may either coil to the right or the left. Coiling to the right is dominant. A homozygous recessive female snail is crossed with a homozygous dominant male snail. All of the offspring have shells that coil to the left. Why do all of the offspring have left-coiled shells?
A
This trait follows a typical Mendelian pattern of inheritance.
B
Only the father's genotype determines the phenotype for shell coiling.
C
Only the mother's genotype determines the phenotype for shell coiling.
D
Shell-coiling is a sex-linked trait.