- BS Media
- Published: 11, Jun, 2017 | Updated: June 11, 2017
This law can be defined as
‘The relative frequencies oi various kinds of genes in a large and randomly mating sexual panmictic population tend to remain constant from generation to generation in the absence of mutation, selection and gene flow”.
If the gametes unite at random, the total number of different genotypes will be.
There is a random union of the gametes with gene ‘A’ and ‘a’ at the Equilibrium state, the population will contain the following frequencies of the genotypes and genes ‘A’ and ‘a’ generation after generation.
- The gent ‘A’ from both this parents will be p c p = p2, ii) for gene ‘a’ will be q x q = q2
- the probability of being heterozygote will be pq + pq = 2 pq.
p +2pq+q =1
- The gene and genotype frequencies of each allele in a population remain at an equilibrium generation after generation.
- In a population, the mating is a completely random manner.
- The equilibrium in the genotype and gene frequencies occurs on in large sized populations. But in small sized population gene frequencies may be un predict table.
- MI the genotypes in a population reproduce equally and successfully,
Therefore, the geno type frequency in the first generation will be TT-25% Tt = 50% and It = 25%. The homgous tasters (Ti’) and heterozygous tasters (Tt) are phenotypic ally alike. So the populations possess 75% tasters and 25% are non-tasters. The same results can be obtained if we consider the union of gametes at the time of fertilization.
There the genotype frequencies according to Hardy-Weinberg’s equation.
p2 ÷2pq+q2 =l (q isfrequency for t )
This law provides a situation, where the genes in the population have reached the equilibrium and the gene pool is constant In such case, there will be no evolution. In nature, the mutations, natural selection, Non- random mating, genetic drifts and differential migration operate to change the genetic equilibrium actually can bring about organic evolution.