What are the chances of a heterozygous recessive male producing offspring with curled ears?

A heterozygous recessive male has one dominant allele and one recessive allele for a trait, like curled ears. If the curled ear trait is recessive, it will only be expressed in offspring if they inherit two recessive alleles (one from each parent). Therefore, if the mother is also heterozygous or homozygous recessive, there is a chance for curled-eared offspring, but if she is homozygous dominant, the male cannot produce curled-eared offspring. The specific chances depend on the genotype of the female parent.