The answer to this question is the Pubis bone. The Pubis bone is a bone that is connected with the pelvic bone that is located below the urinary bladder. The pelvic bone consist of three parts such as ilium, ischium, and pubis.
        
             
        
        
        
Allele frequency is determined by looking at the dominant and recessive allele of a genotype. 
Using the given, we can come up with the following computation for the allele frequency:
allele A = 100/300 allele B = 50/300 allele O = 150/300
Hence, the frequency of allele A is 0.33 or 33%, allele B is .17 or 17% and allele O is 0.50 or 50%.