Genetic Variation and Evolution Concepts

The video tutorial by Teacher Verna on Shenzhen TV explores the mechanisms that produce changes in populations over generations. It covers genetic variation, mutations, and their role in evolution. The tutorial explains natural selection, gene flow, and genetic drift as key mechanisms of population change. It also discusses the Hardy-Weinberg principle, which describes conditions for genetic equilibrium. The lesson aims to make learning science engaging and informative.

What term is used to describe the differences between individuals in a population?

• Mutation

• Variation

• Drift

• Selection

What is the original source of genetic variation?

• Genetic drift

• Gene flow

• Natural selection

• Mutations

What happens when a DNA base pairs incorrectly?

• It leads to genetic drift

• It causes natural selection

• It results in a mutation

• It initiates gene flow

Which process favors organisms better adapted to their environment?

• Gene flow

• Mutation

• Natural selection

• Genetic drift

In the example of tree frogs, which color was more likely to survive in dark wooded areas?

• Gray

• Green

• Brown

• Blue

What does gene flow involve?

• Natural selection of the fittest

• Movement of genes within a single organism

• Movement of genes into or out of a population

• Random mutations in a population

What is genetic drift?

• A change in allele frequencies due to chance

• A form of gene flow

• A process of natural selection

• A type of mutation

What principle states that allele frequencies remain constant in a large, random-mating population?

• Darwin's Theory

• Lamarckism

• Mendelian Inheritance

• Hardy-Weinberg Principle

Which condition is NOT required for genetic equilibrium according to Hardy-Weinberg?

• No natural selection

• Random mating

• Small population size

• No mutations

What happens to allele frequencies if there is no selection, migration, or mutation?

• They decrease

• They increase

• They remain constant

• They change rapidly