The Genetics of Shell Coiling

Can Two Snail Kings Also Have Right-Handed Offspring?

  In the solution to the previously asked question, this time four germ cells are dis-
played for the left snail. This heterozygous snail of course can produce egg cells
as well as sperm cells with the allele L or the allele R.
    RL     LL       LL   The result is clearly visible: The left (heterozygous) snail king may have a certain
number of right handed offspring, which would be impossible in a normal dominant-
recessive pattern of heredity, where both snail kings could only inherit the allele L.

The genetics of snail shell coiling: Heredity pattern with crossing diagrams.