UPCAT Biology — EvolutionSlides
Slide library for Evolution. Every UPCAT Biology concept in this chapter, broken into bite-sized slides that are easy to scan on mobile. Built around University of the Philippines's recent question patterns for the UPCAT 2026.
Exam context
For the University of the Philippines College Admission Test, University of the Philippines tests Biology under a "Core" label, with Evolution in the 7th slot across 7 chapters. UPCAT candidates must clear the UPG ≤ 2.2 typical cut on the 2026 paper, which draws about 20 Biology questions. Date to watch: Mid-2026 (announced by UP Admissions).
Evolution - Slides
Evolution is one of the most important concepts in biology, explaining how all life forms on Earth have changed and developed over time. This chapter explores the fundamental theories that explain how species arise, adapt, and diversify through natural processes. We'll examine the groundbreaking work of Charles Darwin and Jean-Baptiste Lamarck, understanding how their theories shaped our modern understanding of biological evolution.
Slides
Introduction to Evolution
Evolution is the scientific theory that explains how all species of organisms develop and change over time. It helps us understand the diversity of life on Earth and how different species are related to each other.
Notes
This slide introduces the fundamental concept of evolution and sets the stage for understanding the major theories.
Topic
Introduction to Evolution
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mindmap root((Evolution)) Theories Darwin Theory Natural Selection Survival of Fittest Lamarck Theory Use and Disuse Inheritance Evidence Fossils Genetics Observations Applications Medicine Agriculture Conservation
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mermaid_mindmap
Description
Mind map showing the main concepts and branches of evolutionary theory
Charles Darwin: The Father of Modern Evolution
Charles Darwin was a British naturalist whose careful observations and scientific reasoning led to the development of the most widely accepted theory of evolution. His work fundamentally changed how we understand the relationship between all living things.
Notes
Understanding Darwin's background helps students appreciate how scientific theories develop through observation and reasoning.
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Charles Darwin Background
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timeline title Darwin's Journey to Evolution 1809 : Born in England 1831 : Joins HMS Beagle voyage 1835 : Visits Galapagos Islands 1838 : Develops natural selection idea 1859 : Publishes Origin of Species 1882 : Dies leaving lasting legacy
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mermaid_timeline
Description
Timeline showing key events in Darwin's life and development of evolutionary theory
Darwin's Theory of Evolution by Natural Selection
Darwin's theory explains that evolution occurs when individuals with traits that help them survive and reproduce pass these traits to their children. Over many generations, these beneficial traits become more common in the population.
Notes
Natural selection is the core mechanism of Darwin's evolutionary theory.
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Darwin's Natural Selection
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flowchart TD A[Population with Variation] --> B{Environmental Pressure} B --> C[Some Survive Better] C --> D[Successful Individuals Reproduce] D --> E[Pass Traits to Offspring] E --> F[Population Changes Over Time] F --> G[New Species May Form] G --> A
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mermaid_flowchart
Description
Flowchart showing the cyclical process of natural selection leading to evolutionary change
Key Components of Natural Selection
For natural selection to work, four conditions must be present. These conditions ensure that beneficial traits become more common in populations over time, leading to evolutionary change.
Notes
These four components work together to drive evolutionary change through natural selection.
Topic
Components of Natural Selection
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flowchart LR A[fa:fa-users Variation] --> B[fa:fa-dna Inheritance] B --> C[fa:fa-check Selection] C --> D[fa:fa-clock Time] D --> E[fa:fa-star Evolution] E --> A
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mermaid_flowchart
Description
Circular diagram showing the four key components needed for natural selection to occur
Survival of the Fittest
The phrase 'survival of the fittest' is often misunderstood. In evolution, 'fittest' doesn't mean physically strongest, but rather best adapted to survive and reproduce in a particular environment.
Notes
Understanding fitness as reproductive success rather than physical strength is crucial for grasping natural selection.
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Survival of the Fittest
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stateDiagram-v2 [*] --> Individual Individual --> Survives: Has favorable traits Individual --> Dies: Lacks favorable traits Survives --> Reproduces Reproduces --> PassesTraits: To offspring PassesTraits --> NextGeneration NextGeneration --> [*]
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mermaid_stateDiagram
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State diagram showing how individuals with favorable traits contribute to the next generation
Jean-Baptiste Lamarck: Early Evolutionary Thinking
Lamarck was one of the first scientists to propose that species could change over time. While his specific mechanisms were later proven incorrect, his work was important in establishing the concept that life forms are not fixed and unchanging.
Notes
Lamarck's contributions to evolutionary thinking were historically significant even though his specific mechanisms were incorrect.
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Jean-Baptiste Lamarck Background
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Lamarck's Theory: Law of Use and Disuse
Lamarck's Law of Use and Disuse suggests that the more an animal uses a part of its body, the stronger and better it becomes. He believed these changes could then be passed on to offspring.
Notes
While this mechanism is now known to be incorrect, it was a logical attempt to explain how evolution might work.
Topic
Law of Use and Disuse
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S7
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mermaid
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7
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flowchart TD A[fa:fa-dumbbell Frequent Use of Organ] --> B[fa:fa-arrow-up Organ Becomes Stronger] C[fa:fa-ban Lack of Use] --> D[fa:fa-arrow-down Organ Becomes Weaker] B --> E[fa:fa-baby Changes Inherited by Offspring] D --> E E --> F[fa:fa-refresh Next Generation Shows Changes]
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mermaid_flowchart
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Flowchart illustrating Lamarck's Law of Use and Disuse and inheritance of acquired characteristics
Lamarck's Theory: Inheritance of Acquired Characteristics
According to Lamarck, when an organism faces environmental challenges, it develops certain organs or abilities to meet those challenges. These newly acquired characteristics are then passed on to the next generation.
Notes
This concept of inheritance of acquired characteristics was later disproven by modern genetics.
Topic
Inheritance of Acquired Characteristics
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S8
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mermaid
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8
Mermaid Diagram
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sequenceDiagram participant E as Environment participant O as Organism participant T as Traits participant N as Next Generation E->>O: Presents Challenge O->>T: Develops New Characteristics T->>O: Organism Adapts O->>N: Passes Traits to Offspring N->>N: Inherits Acquired Traits
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mermaid_sequence
Description
Sequence diagram showing how Lamarck believed acquired characteristics were inherited
The Famous Giraffe Example
The giraffe's long neck is often used to compare Lamarck's and Darwin's theories. This example helps illustrate the fundamental difference between acquired characteristics and natural selection.
Notes
This classic example clearly demonstrates the difference between the two evolutionary theories.
Topic
Giraffe Neck Evolution Example
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S9
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flowchart LR subgraph Lamarck A1[Short Neck Giraffe] --> B1[Stretches to Reach Food] B1 --> C1[Neck Becomes Longer] C1 --> D1[Passes Long Neck to Offspring] end subgraph Darwin A2[Population with Neck Variation] --> B2[Long-necked Survive Better] B2 --> C2[Reproduce More Successfully] C2 --> D2[Long Necks Become Common] end
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mermaid_flowchart
Description
Comparison of Lamarck's vs Darwin's explanation for giraffe neck evolution
Comparing Darwin's and Lamarck's Theories
While both theories explain evolutionary change, they propose different mechanisms. Darwin's theory is based on selection from existing variation, while Lamarck's suggests organisms can develop needed traits during their lifetime.
Notes
Understanding the differences helps students grasp why Darwin's theory became widely accepted while Lamarck's was largely rejected.
Topic
Theory Comparison
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flowchart TD A[Evolutionary Change] --> B[Darwin Theory] A --> C[Lamarck Theory] B --> D[Natural Selection] B --> E[Random Variation] B --> F[Inherited Traits] C --> G[Use and Disuse] C --> H[Directed Change] C --> I[Acquired Characteristics]
Type
mermaid_flowchart
Description
Comparison flowchart showing the key differences between Darwin's and Lamarck's evolutionary theories
Why Darwin's Theory is Accepted Today
Modern science has provided overwhelming evidence for Darwin's theory through genetics, molecular biology, and direct observation. We now understand that DNA provides the mechanism for inheritance that Darwin proposed.
Notes
Modern genetic evidence strongly supports Darwin's mechanism of natural selection acting on inherited variation.
Topic
Modern Evidence for Darwin
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mermaid
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flowchart TD A[fa:fa-dna DNA Mutations] --> B[fa:fa-users Create Variation] B --> C[fa:fa-flask Environment Selects] C --> D[fa:fa-heart Successful Reproduction] D --> E[fa:fa-baby Traits Passed to Offspring] E --> F[fa:fa-line-chart Population Changes] F --> G[fa:fa-star Evolution Occurs]
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mermaid_flowchart
Description
Modern understanding of how genetic variation and natural selection drive evolution
Problems with Lamarck's Theory
While Lamarck's ideas were innovative for his time, modern science has shown that characteristics acquired during an organism's lifetime cannot be passed to offspring through the usual genetic mechanisms.
Notes
Scientific evidence and experimentation showed that Lamarck's proposed mechanism does not occur in nature.
Topic
Problems with Lamarck's Theory
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mermaid
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flowchart TD A[Acquired Characteristic] --> B{Can it be inherited?} B -->|Lamarck Says Yes| C[Should appear in offspring] B -->|Science Shows No| D[Does not appear in offspring] C --> E[fa:fa-times Experiments disprove this] D --> F[fa:fa-check Confirmed by genetics] E --> G[Theory Rejected] F --> H[Darwin Theory Supported]
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mermaid_flowchart
Description
Flowchart showing how experiments and genetics disproved Lamarck's inheritance mechanism
Evidence for Evolution
Multiple lines of evidence support evolutionary theory. From ancient fossils to modern genetic analysis, science provides overwhelming proof that evolution occurs through the mechanisms Darwin described.
Notes
Multiple independent lines of evidence all point to the same conclusion about evolutionary processes.
Topic
Evidence for Evolution
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S13
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pie title Evidence for Evolution "Fossil Record" : 25 "Genetic Analysis" : 30 "Direct Observation" : 20 "Biogeography" : 15 "Developmental Biology" : 10
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mermaid_pie
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Pie chart showing different types of evidence supporting evolutionary theory
Evolution in Action: Modern Examples
Evolution is not just a historical process - we can observe it happening today. Fast-reproducing organisms like bacteria and viruses provide clear examples of natural selection in action.
Notes
These modern examples help students understand that evolution is an ongoing process we can observe directly.
Topic
Modern Evolution Examples
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timeline title Evolution in Real Time 1940s : DDT kills most insects 1950s : Some insects survive 1960s : Resistant insects increase 1970s : DDT becomes less effective Today : Many insects DDT-resistant
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mermaid_timeline
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Timeline showing how pesticide resistance evolved over decades
Summary: Understanding Evolution
Evolution is a fundamental principle of biology that explains the diversity and unity of life. Understanding both historical and modern perspectives helps us appreciate how scientific knowledge develops and improves over time.
Notes
This summary reinforces the main concepts and shows how they connect to form a complete understanding of evolutionary theory.
Topic
Chapter Summary
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mindmap root((Evolution Summary)) Darwin Natural Selection Scientific Evidence Modern Applications Lamarck Historical Importance Use and Disuse Disproven Mechanism Key Concepts Variation Inheritance Selection Time
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mermaid_mindmap
Description
Summary mind map of key concepts covered in the evolution chapter
References
- Darwin, C. (1859). On the Origin of Species by Means of Natural Selection
- Lamarck, J.B. (1809). Philosophie Zoologique
- Modern Biology Textbooks and Philippine Science Curriculum
- UPCAT Review Materials for Biology
- Scientific journals on evolutionary biology and genetics
In summary
Evolution is one of the most important unifying concepts in biology, providing a scientific explanation for the diversity of life on Earth. While both Darwin and Lamarck contributed to our understanding of how species change over time, modern science has confirmed Darwin's theory of evolution by natural selection. Through genetic evidence, direct observation, and extensive research, we now understand that evolution occurs when natural selection acts on inherited variation within populations. This understanding is not just academically important - it has practical applications in medicine, agriculture, and conservation. As students preparing for the UPCAT and other entrance exams, understanding evolution will help you tackle questions in biology and appreciate the scientific method that leads to reliable knowledge.
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