While most commercial hens lay white eggs, certain Chinese and Chilean hens lay blue-green eggs. It is the result of an insertion mutation that causes blue eggshell pigment to be inherited as a dominant (B) allele (this was discovered by Punnett himself). In a flock of hens, there were 70 birds laying blue eggs and 30 laying white eggs. What is the genotype frequency for the recessive (b) form? If it is impossible to tell, enter 0. Report as a proportion, not percentage, e. g., 0.1, NOT 10%.