Question

type of genetic drift where a population is drastically decreased due to a chance event like a natural disaster.
variation
mutation
population bottleneck
geographic isolation
founder effect
frequency
natural selection
evolution

Explanation:

To solve this, we analyze each option:

• Variation: Refers to differences in traits, not population decrease due to disaster.
• Mutation: Change in DNA, not related to population size drop from disaster.
• Population Bottleneck: Defined as a genetic drift event where a population is drastically reduced by a chance event (like natural disaster), matching the description.
• Geographic Isolation: Separation by geography, not population decrease from disaster.
• Founder Effect: Occurs when a small group starts a new population, not a drastic decrease of an existing one.
• Frequency: Related to allele frequencies, not the event described.
• Natural Selection: Process of adaptive evolution, not a chance - based population decrease.
• Evolution: Change in species over time, not the specific event here.

Answer:

C. Population Bottleneck