Why is the size of the beach decreasing on the end without barrier islands?

15:1

Explanation:

Normal shape leaf is controlled by A/_ or B/_.

Pure breeding normal leaf shape plant would have the genotype AABB.

A pure breeding lacerate leaf plant would have the genotype aabb.

              AABB    x    aabb

                         AaBb

At F1, all the offspring would have normal shape leaves. If F1 is selfed:

        AaBb    x    AaBb

A_B_  Normal leaved plants = 15/16

aabb Lacerate leaved plants =  1/16 (See the attached image for the Punnet's square)

Hence, the ratio of normal:lacerate leaved plants at F2 would be 15:1