Question

Sinistral and dextral type od shell coiling in lymnea is directly influenced by?

Answer 1

Answer:

In the cross dextral x sinistral all the F, progeny have dextial coils implying that dextral is dominant over sinistral. However, in the F 1, x F 1, cross (i.e., inbreeding), all the F 1 snails are also dextral. The reciprocal cross (dextral x sinistral ) produces F 1, progeny that are all left coiler.