About This Chapter
Genetics & Populations - Chapter Summary
Use this overview of genetics and populations to better understand changes in the genetic makeup of a population. Lessons provide in-depth analyses of gene flow, genetic drift, allopatric speciation, point mutations and more. Navigate the lessons at a comfortable pace. When finished, you should be able to:
- List the types, processes and effects of point mutations
- Discuss the effects of frameshift mutations
- Share the definitions of aneuploidy and polyploidy
- Explain why natural selection acts on phenotype instead of genotype
- Define gene flow and genetic drift
- Describe the genetic implications of the gene pool
- Provide details about genome evolution and artificial selection in evolution
- Understand the meaning of allopatric speciation
All resources in this chapter are available in a secure online environment that enables you to study genetics and populations anytime using your computer, smartphone or tablet. Choose the lessons you want to review and visit them as often as you'd like to ensure you fully comprehend the topics they cover. Take their multiple-choice quizzes to gauge your genetics and populations knowledge. Get an even broader review by taking this chapter's comprehensive practice exam.
1. Point Mutations: Types, Processes & Effects
You might not think about your DNA that often, but you would probably notice if something was mutated on your DNA! This lesson will discuss what happens when your DNA gets mutated, focusing specifically on point mutations and their impacts.
2. Effects of Frameshift Mutations: Definitions and Examples
What is a frameshift in genetic translation? How can a frameshift mutation change a protein? In this lesson, learn about the codon reading frame and how frameshift mutations cause serious problems for polypeptide formation.
3. Aneuploidy & Polyploidy: Definition & Examples
We are going to cover the terms ploidy, aneuploidy, and polyploidy in this lesson. We'll also explain how each of these occurs and get examples of each.
4. Why Natural Selection Acts on Phenotype, Not Genotype
Evolution works through the mechanism of natural selection. This mechanism influences the genetic make-up of populations, acting on the population's physical traits. In this lesson, we'll explore examples of why this is.
5. Gene Flow: Definition & Examples
Chances are you've probably witnessed gene flow today! This lesson will define gene flow and give examples. It will also explain why gene flow creates genetic diversity.
6. Genetic Drift: Definition, Examples & Types
Genetic drift reduces genetic variability of a population by decreasing the size of the population. The change in population size and variability often leads to new species and unique populations.
7. Genetic Implications of the Gene Pool
This lesson explores the relationship between the gene pool, genetic diversity, as well as factors such as population size and inbreeding and their effect on the gene pool.
8. Genome Evolution: Duplication, Rearrangement & Mutation
The entire genome of a species can evolve in novel ways that may lead to death or to the development of a new species. This can happen through duplication, rearrangement, and mutation.
9. Allopatric Speciation: Example & Definition
If a continent splits, or a mountain range rises, one population can become two, and eventually the two populations may not be able to interbreed. Discover how species can split off from each other when they are separated.
10. Artificial Selection in Evolution
Humans have been selectively breeding for desirable traits in plants and animals for a long time. This artificial selection allows for a lot of control in the breeding process but can also lead to unintended mutations within a population of organisms.
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