All offspring bean plants will be recessive homozygotes with wrinkled seeds.
If S is dominant allele responsible smooth seeds, and s is recessive allele responsible for wrinkled seeds, then genotypes will be:
SS - dominant homozygote with smooth seeds.
Ss - homozygote with smooth seeds.
ss - recessive homozygote with wrinkled seeds.
Cross between two recessive homozygotes (ss) will give all offspring with the same genotype (ss) as can be seen in the attached picture.
