Evolution and Natural Selection
Evolution explains how living organisms change over generations through the inheritance of genetic traits, while natural selection is the primary mechanism that drives these changes. Proposed by Charles Darwin, the theory of evolution by natural selection describes how individuals with advantageous inherited traits are more likely to survive, reproduce, and pass those traits to future generations. Understanding evolution is fundamental to biology because it explains the diversity of life, the relationships among species, and how organisms adapt to changing environments. This flashcard deck covers the essential concepts of evolution and natural selection, including variation, adaptation, fitness, populations, speciation, reproductive isolation, common ancestry, fossils, homologous and analogous structures, convergent and divergent evolution, and the scientific evidence supporting evolutionary theory. It also explores how genetic variation provides the foundation for natural selection and how evolutionary processes shape biodiversity over time. Designed for biology students, educators, and lifelong learners, these flashcards present key concepts in a clear question-and-answer format that promotes active learning, exam preparation, and long-term retention. Whether you are studying evolutionary biology for the first time or reviewing core concepts for assessments, this deck provides an effective way to understand the mechanisms of evolution and the evidence that supports one of biology's most important scientific theories.
All Cards in This Deck
Question
What is evolution?
Answer
Evolution is the change in the inherited characteristics of populations over successive generations.
Question
Who proposed the theory of evolution by natural selection?
Answer
Charles Darwin.
Question
What is natural selection?
Answer
Natural selection is the process by which individuals with advantageous traits are more likely to survive and reproduce.
Question
What is an adaptation?
Answer
An adaptation is an inherited characteristic that increases an organism's chances of survival and reproduction in a particular environment.
Question
What is variation in a population?
Answer
Variation refers to differences in traits among individuals within the same population.
Question
Why is genetic variation important for evolution?
Answer
Genetic variation provides the differences on which natural selection acts.
Question
What is a population in evolutionary biology?
Answer
A population is a group of individuals of the same species living in the same area and capable of interbreeding.
Question
What is fitness in evolutionary biology?
Answer
Fitness is an organism's ability to survive and produce fertile offspring.
Question
What is artificial selection?
Answer
Artificial selection is the process in which humans selectively breed organisms for desired traits.
Question
What is speciation?
Answer
Speciation is the formation of new species through evolutionary processes.
Question
What is reproductive isolation?
Answer
Reproductive isolation occurs when populations can no longer interbreed and produce fertile offspring.
Question
What is a fossil?
Answer
A fossil is the preserved remains or traces of an organism from the past.
Question
How do fossils provide evidence for evolution?
Answer
Fossils document changes in organisms over time and reveal evolutionary relationships.
Question
What is homologous structure?
Answer
A homologous structure is a body part shared by different species because of common ancestry.
Question
What are analogous structures?
Answer
Analogous structures perform similar functions but evolved independently in different species.
Question
What is convergent evolution?
Answer
Convergent evolution is the independent evolution of similar traits in unrelated species.
Question
What is divergent evolution?
Answer
Divergent evolution occurs when related species become increasingly different over time.
Question
What is common ancestry?
Answer
Common ancestry is the concept that different species evolved from shared ancestral organisms.
Question
What evidence supports the theory of evolution?
Answer
Fossils, comparative anatomy, embryology, molecular biology, and biogeography all provide evidence for evolution.
Question
Why is natural selection considered a mechanism of evolution?
Answer
Because it changes the frequency of inherited traits in populations over generations by favoring beneficial characteristics.