**In this article we will discuss about Hardy & Weinberg Principle**

- This law was proposed by Hardy & Weinberg in 1908
- Allele and genotype frequencies in a population will remain constant from generation to generation. In absence of evolutionary influences
- When gene frequency remain constant generation and generation the population is called genetic equilibrium or hardy Weinberg equilibrium
- The population in genetic equilibrium, the rate of evolution is zero
- Evolution occur only when hardy Weinberg equilibrium is altered

**Conditions of the Hardy-Weinberg population are:**

- The population must be large.
- Mating must be random, with no selection for certain genotypes.
- There must be no emigration or immigration.
- There may be no mutations.
- There may be no incestuous mating.

**Application of hardy and weinberg**

- Hardy Weinberg law is represented by simple formula
**Formula 1: P+q=1**- p= Frequency of dominant allele
- q= Frequency of recessive allele

- This formula is used to find out the frequency of dominant allele and recessive allele in a population
**Formula 2: p2+2pq+q2=1**- Frequency of dominant homozygous
- Frequency of heterozygous
- Frequency of recessive homozygous

- Frequency of heterozygous and homozygous in a population can be calculated by another Hardy Weinberg formula