Allele frequency

• The gene pool

  all alleles in a population
• Allele frequency

  probability of an allele appearing in a gene pool.
• In any population with two alleles for a gene the frequency of recessive and dominant allele will equal one. 
• Hardy-Weinberg principle

  p+q =1

  p2+pq+q2=1
• p+q =1

  p2+pq+q2=1

  p= probability of dominant allele.

  q= probability of recessive allele.
• Allele frequencies will remain constant from generation to generation

  given that there are no mutations, migration of natural selection, very large population and mating occurs randomly.