Hardy Weinberg Equation

Important Definitions

What is a gene pool? What is an allele? What is a Punnett Square Describe heterozygous, homozygous recessive, an homozygous dominant

Hardy Weinberg Equation

The biological sciences now generally define evolution the change in allele frequency in the gene pool over time.

http://zoology.okstate.edu/zoo_lrc/biol1114/tutorials/Flash/life4e_15-6-OSU.swf

 For instance, let us assume that there is a trait that is determined by the inheritance of a gene with two alleles--B and b (Complete dominance).  If the parent generation has 92% B and 8% b and their offspring collectively have 90% B and 10% b, evolution has occurred between the generations.

Hardy Weinberg Equation

Godfrey Hardy(1877-1947)

Wilhelm Weinberg

(1862-1937)

Hardy Weinberg Equation

Hardy, Weinberg, and the population geneticists who followed them came to understand that evolution will not occur in a population if seven conditions are met:

1.   mutation is not occurring 2.  natural selection is not occurring 3.  the population is infinitely large 4.  all members of the population breed 5.  all mating is totally random 6.  everyone produces the same number of offspring 7.  there is no migration in or out of the population

Hardy Weinberg Equation

p + q = 1

p = freq. dominant allele (A)q = freq. recessive allele (a)

p² + 2pq + q²= 1 and p + q=1

p² = freq. homozygous dominant (AA)2pq = freq. Heterozygous (Aa)

q² = freq. homozygous recessive (aa)

Hardy Weinberg Equation