Isolation of Alleles

Background:

Allele frequency- refers to how common an allele is in a population. It is determined by counting how many times the allele appears in the population then dividing by the total number of copies of the gene.

Phenotypes- the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.

Genotype- the genetic constitution of an individual organism.

Genetic Drift- variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.

Objectives:

This activity will demonstrate the effects of genetic isolation on a small population and how that lead to the evolution of 5 defined biological races. (Caucasoid (White) race. Negroid (Black) race. Capoid (Bushmen/Hottentots) race.

Mongoloid (Oriental/ Amerindian) race. Australoid (Australian Aborigine and Papuan) race.)

Procedures:

  1. Grab the Colored a baggie Skittles organism and a paper towel; this represents the original population of homosapiens.
  2. Count the number of Skittles in your baggie and record this data in Table 1.
  3. Count the number of each color and record this in Table 1.
  4. Calculate the percentage of each color present in this population

  1. Open your baggie # of whole and WITHOUT LOOKING, remove 6 Skittles and place them on the paper towel; this represents the genetic drift population.
  2. Count the number of each color and record this in Table 1 under “isolation of a small population
  3. Like before, calculate the percentage of each color in this population.

DO NOT TASTE THE RAINBOW

Table 1: Population Numbers of Original and Genetic Isolated Populations

Data Analysis: Use the circles below to show the percentage of each color present in each of the populations