Genetic Variation and Polymorphism Concepts

The video discusses genetic polymorphism, its definition, and significance in promoting diversity within populations. It explains mechanisms like heterozygous advantage and frequency-dependent selection that maintain polymorphism. Examples such as human blood types and sickle cell anemia illustrate these concepts. The video differentiates between balanced and transient polymorphism, highlighting their features and examples like industrial melanism. It concludes with a call to action for viewers to engage with the content.

What is a key characteristic of genetic polymorphism?

• Existence of multiple forms of DNA sequences at a locus

• Existence of a single form of DNA sequence

• Existence of multiple species in a single population

• Existence of a single phenotype in a population

Which of the following is an example of genetic polymorphism in humans?

• Skin color

• ABO blood group system

• Height

• Eye color

What mechanism can maintain genetic polymorphism over generations?

• Heterozygous advantage

• Random mating

• Founder effect

• Genetic bottleneck

Which of the following is NOT a source of genetic variation?

• Genetic drift

• Migration

• Natural selection

• Cloning

In balanced genetic polymorphism, what is the relationship between morphs?

• One morph is eliminated

• Morphs coexist in equilibrium

• One morph dominates the other

• Morphs are constantly changing

Which condition is an example of balanced genetic polymorphism?

• Industrial melanism

• Albinism

• Cystic fibrosis

• Sickle cell anemia

Which of the following is a feature of balanced polymorphism?

• Morphs have equal selective advantage

• Morphs are eliminated over time

• One morph has a selective advantage

• Morphs are constantly changing

What happens in transient polymorphism?

• Morphs remain unchanged

• Morphs coexist in equilibrium

• One morph is gradually replaced by another

• All morphs are eliminated

What environmental change led to industrial melanism?

• Change in humidity

• Change in temperature

• Increase in pollution

• Decrease in pollution

What is a key feature of transient polymorphism?

• Equal fitness of all morphs

• Temporary dominance of one morph

• No change in morph frequency

• Stable coexistence of morphs