Main page / Astigmatism / Glasses and lenses to correct astigmatism. Glasses with special cylindrical lenses are the most common ways to correct astigmatism. According to the statistics released by leading ophthalmological companies, up to 80% of astigmatic patients prefer eye glasses for vision correction.
Population:A group of individuals of the same species, the same geographic area, at the same time, regularly interbreed Gene Pool:The collection of all gametes in a population Genotype Frequency: the frequency or proportion of genotypes in a population.llele Frequency: determines how frequent the allele expression of a particular gene arises in a population. Phenotype Frequency: A ratio stating the number of times a specific phenotype occurs in a population.
Thus, this entire population consists of 12,258 (6129 X 2) alleles at the blood type locus. To deter mine the allelic frequencies we simply count the number of M or N alleles and divide by the total number of alleles. So the allelic frequency for the M allele will be:f(M) = [(2 x 1787) + 3039]/12,258 = 0.5395 and the frequency for the N allele will be: f(N) = [(2 x 1303) + 3039]/12,258 = 0.4605 By convention one of the alleles is given the designation P and the other q. Thus for the data we presented above, p=0.5395 and q=0.4605.Because we are analyzing all the alleles, the frequencies shoul d sum to 1.0 and p + q = 1.Furthermore, a population is considered by population geneticists to be polymorphic if two alleles are segregating and if the frequency of the most frequent allele is less than 0.99.y convention one of the alleles is given the designation P and the other q. Thus for the data we presented above, p=0.5395 and q=0.4605. Because we are analyzing all the alleles, the frequencies shoul d sum to 1.0 and p + q = 1.