BIOL1307 Chapter 19 Review

Which of the following is the most dominant evolutionary force?

• Genetic Drift

• Mutation

• Natural Selection

• Gene Flow

Answer explanation

Natural selection is the primary force driving the evolution of populations.

What is the primary source of new traits in populations?

• Gene Flow

• Mutation

• Natural Selection

• Genetic Drift

Answer explanation

Mutations introduce new traits by altering the genetic material of organisms.

The rediscovery of Mendel’s work in the early 20th century led to which important concept?

• Blending inheritance

• The Modern Synthesis

• Lamarckism

• Inheritance of Acquired Characteristics

Answer explanation

The Modern Synthesis unified Darwin's theory of evolution with Mendelian genetics.

What is the definition of allele frequency?

• The ratio of dominant alleles in a population

• The rate at which a specific allele appears in a population

• The average gene size in a population

• The total number of alleles in a population

Answer explanation

Allele frequency refers to how common a particular allele is in the gene pool.

Which term describes the sum of all alleles in a population?

• Gene Flow

• Allele Pool

• Gene Pool

• Genetic Drift

Answer explanation

The gene pool is the total collection of alleles in a population.

What principle explains the stability of allele frequencies in the absence of evolutionary forces?

• Bottleneck Effect

• Hardy-Weinberg Principle

• Founder Effect

• Genetic Drift

Answer explanation

This principle provides a mathematical model of a non-evolving population.

What happens during a bottleneck event in a population?

• Gene flow increases

• A large portion of the population's genome is wiped out

• Mutation rates decrease

• New alleles are introduced

Answer explanation

The bottleneck effect occurs when a population undergoes a drastic reduction in size, affecting genetic diversity.

Which evolutionary force is the result of random changes in allele frequencies?

• Genetic Drift

• Natural Selection

• Gene Flow

• Mutation

Answer explanation

Genetic drift refers to random changes in allele frequencies that can happen by chance, especially in small populations.

What is an example of non-random mating?

• Genetic Drift

• Assortative mating

• Natural Selection

• Founder Effect

Answer explanation

Non-random mating occurs when individuals with similar phenotypes are more likely to mate.

Which evolutionary force can introduce new genetic variation into populations?

• Genetic Drift

• Gene Flow

• Bottleneck Effect

• Hardy-Weinberg Equilibrium

Answer explanation

Gene flow refers to the movement of alleles between populations, introducing new genetic variation.