Hardy-Weinberg Principle

The video tutorial introduces population genetics, focusing on the calculation of genotypic and allelic frequencies within a population. It explains the Hardy-Weinberg principle, which states that allelic and genotypic frequencies remain constant in a large, randomly mating population free from mutation, migration, and natural selection. The tutorial also discusses factors that cause deviations from this equilibrium, such as mutations and genetic drift, and explores different types of natural selection, including stabilizing, directional, and disruptive selection.

What is the total number of individuals with genotype Bb in the hypothetical population?

• 100

• 500

• 400

• 600

Which allele is dominant in the hypothetical population example?

• B

• b

• Both are dominant

• Neither is dominant

According to the Hardy-Weinberg principle, what must be true for allelic frequencies to remain constant?

• Natural selection must be present

• Mutations must occur frequently

• There must be random mating

• The population must be small

What is the probability of obtaining a Bb genotype according to the Hardy-Weinberg equation?

• p^2

• q^2

• 2pq

• pq

Which of the following is NOT a factor that disrupts Hardy-Weinberg equilibrium?

• Genetic drift

• Random mating

• Mutation

• Gene flow

What is a population bottleneck?

• A large population with high genetic diversity

• A significant reduction in population size

• A population with no genetic drift

• A small group of individuals separating from a large population

Which type of natural selection favors individuals with intermediate phenotypes?

• Stabilizing selection

• Disruptive selection

• Directional selection

• Random selection

What type of selection did Charles Darwin observe in finches on the Galapagos Islands?

• Directional selection

• Stabilizing selection

• Artificial selection

• Disruptive selection

In disruptive selection, what happens to the population curve?

• It remains unchanged

• It splits into two peaks

• It shifts to one side

• It becomes a single peak

Which type of selection eliminates extreme phenotypes from a population?

• Balancing selection

• Disruptive selection

• Stabilizing selection

• Directional selection