AP BIOLOGY

Detailed explanation-1: -An allele frequency is calculated by dividing the number of times the allele of interest is observed in a population by the total number of copies of all the alleles at that particular genetic locus in the population. Allele frequencies can be represented as a decimal, a percentage, or a fraction.

Detailed explanation-2: -Another aspect of alleles and segregation is the concept of allele frequencies within a population. On an individual level, a person has a 0.5 chance of passing on one of two alleles for a given gene.

Detailed explanation-3: -For a three allele system: p, q and r, the frequencies can be denoted as: p2 + q2 + r2 + 2pq + 2pr + 2qr = 1. It is possible to display the data for a bi-allelic locus within a population graphically using a de Fitetti diagram. This graphical display is often referred to as the Hardy-Weinberg parabola.