In a species of flowering plant, the gene for flower colour has alleles $A$ (dominant) and $a$ (recessive), and the gene for leaf shape has alleles $B$ (dominant) and $b$ (recessive). These genes are autosomally linked on the same chromosome, as shown in the diagram below.

A heterozygous plant with the genotype $AB/ab$ is crossed with a homozygous recessive plant ($ab/ab$).

What is the expected percentage of offspring that will display the recombinant phenotype associated with the genotype $Ab/ab$?