Zoology MCQs
Topic Notes: Zoology
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
What is the term for a sharp reduction in population size caused by environmental events such as earthquakes, floods, or droughts?
Answer:
bottleneck effect
The bottleneck effect occurs when a population's size is drastically reduced for at least one generation due to environmental events. This reduction significantly limits the genetic variation within the surviving population, as the remaining individuals represent only a small, random sample of the original gene pool. This process can lead to increased genetic drift and may influence the future evolutionary trajectory of the species.
2
What is the term for changes in gene frequencies within a population resulting from the migration of individuals?
Answer:
gene flow
Gene flow, also known as gene migration, refers to the transfer of genetic material from one population to another. When individuals migrate and interbreed with a new population, they introduce new alleles or change the frequency of existing alleles, which can significantly alter the genetic structure of the recipient population over time.