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Genetic Drift is Random- Genetic drift occurs in small populations when an allele becomes more or less common simply by chance. There is a random change in allele frequency.

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1. Genotype-The genetic makeup of an organism
2. Phenotype-An individual's observable traits
3. Population-A group of individuals of the same species living and interbreeding within a given area
4. Gene pool-The total genetic diversity found within a population or a species
5. Relative frequency-The average number of occurrences of a particular event in a large number of repeated trials
6. Evolution-Any change in the relative frequency of alleles in the gene pool of a population over time
7. Single-gene trait-Controlled by only one gene
8. Polygenic trait-Controlled by two or more gene
9. Crossing-over-Exchange of genetic material between between chromosomes in sexual reproduction
10.Gene family-Set of similar or related genes formed by duplication of an original gene

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This chapter is important because it describes how species evolve to better adapt to their environment. A real life example of the evolution process is Darwin's Finches. Studies of his finches have shown that all species have descended from a common ancestor, and there are ones that claim good adaptations that help them survive and reproduce in their environments. The studies have also shown that Finches evolve from natural selection. They found offsprings beaks to be 3 to 4 percent larger because their beaks are related to feeding strategies.

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What does the crossing-over of chromosomes provide for organisms?
~Genetic variety

What causes allele frequencies to change in a gene pool during genetic drift?
~Chance Events

Describe the effect population size has on how fast/slow genetic drift occurs in an environment?
~The smaller the population size, the quicker genetic drift sweeps through the organisms

What is one similarity between natural selection and genetic drift?
~Natural selection and genetic drift are similar in that they both result in a change in the allele frequency of a population