BiologyChapter 14: Evolution
Evidence of Evolution
Fossils: sequence in rocks, transitional named (Archaeopteryx if the book).
Learning objectives
- Explain evidence of evolution in clear biological language.
- Distinguish 1. body evidence from 2. molecules and maps.
- Use the key terms to answer a short Federal Board exam question.
Definition
Fossils: sequence in rocks, transitional named (Archaeopteryx if the book). Homologous limbs: same bones, different jobs (descent). Analogous: same job, different origin (wing of insect and bird) — convergent. Vestigial: leftover (whale pelvis named). Embryos: pharyngeal slits named carefully, not Haeckel copies. DNA/protein similarity. Biogeography: islands, Darwin's finches named. These are school evidences, not a creation-debate script. Multiple independent lines of evidence — fossils, comparative anatomy, embryology, molecular biology, biogeography — all support common descent and evolution over deep time.
Important terms
- EVIDENCE OF EVOLUTION
- Fossils: sequence in rocks, transitional named (Archaeopteryx if the book).
- 1. BODY EVIDENCE
- Pentadactyl limb.
- 2. MOLECULES AND MAPS
- Cytochrome c, haemoglobin differences counted.
Overview
Rocks, bones, molecules:
Body Evidence
Pentadactyl limb. Vestigial appendix/coccyx named with caution (function debates exist; use the book's list). Fossil order: simple earlier in the school tale. Homologous structures: same origin, different function (forelimbs). Vestigial: reduced remnants (appendix, whale pelvis). Fossil sequence shows change over time.
Examples Horse fossils named · Whale ancestors named · Do not fake fossils
Molecules and Maps
Cytochrome c, haemoglobin differences counted. Closely related species: fewer differences. Islands: unique species from few colonisers. Radiometric dating named as a clock idea, not a lab method here.
Examples Finches · Marsupials Australia named · DNA as a text
WHAT — EVIDENCE OF EVOLUTION
Fossils: sequence in rocks, transitional named (Archaeopteryx if the book). Homologous limbs: same bones, different jobs (descent). Analogous: same job, different origin (wing of insect and bird) — convergent. Vestigial: leftover (whale pelvis named). Embryos: pharyngeal slits named carefully, not Haeckel copies. DNA/protein similarity. Biogeography: islands, Darwin's finches named. These are school evidences, not a creation-debate script. Multiple independent lines of evidence — fossils, comparative anatomy, embryology, molecular biology, biogeography — all support common descent and evolution over deep time.
WHY — Why this topic matters
EVIDENCE OF EVOLUTION is an independent FBISE learning unit because students must connect its structures and processes with their biological functions and examples.
HOW — How it works
BODY EVIDENCE: Pentadactyl limb. Vestigial appendix/coccyx named with caution (function debates exist; use the book's list). Fossil order: simple earlier in the school tale. Homologous structures: same origin, different function (forelimbs). Vestigial: reduced remnants (appendix, whale pelvis). Fossil sequence shows change over time. Examples: Horse fossils named; Whale ancestors named; Do not fake fossils. MOLECULES AND MAPS: Cytochrome c, haemoglobin differences counted. Closely related species: fewer differences. Islands: unique species from few colonisers. Radiometric dating named as a clock idea, not a lab method here. Examples: Finches; Marsupials Australia named; DNA as a text. Exam homologous vs analogous. Homologous: common ancestry maybe new job. Analogous: same job different ancestry. Bat wing and human arm: homologous.
In simple words
Evidence list. Original wording, no textbook paragraphs copied.
Key points
- fossils + homology + DNA
- analogous is not homology
- same plan, new use
- fewer differences = closer
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Evidence of Evolution
Sticky Notes · Quick Revision
Core Idea
- Fossils: sequence in rocks, transitional named (Archaeopteryx if the book). Homologous limbs: same bones, different jobs (descent). Analogous: same job, different origin (wing of insect and bird) — convergent. Vestigial: leftover (whale pelvis named). Embryos: pharyngeal slits named carefully, not Haeckel copies. DNA/protein similarity. Biogeography: islands, Darwin's finches named. These are school evidences, not a creation-debate script. Multiple independent lines of evidence — fossils, comparative anatomy, embryology, molecular biology, biogeography — all support common descent and evolution over deep time.
1. BODY EVIDENCE
- Pentadactyl limb. Vestigial appendix/coccyx named with caution (function debates exist; use the book's list). Fossil order: simple earlier in the school tale. Homologous structures: same origin, different function (forelimbs). Vestigial: reduced remnants (appendix, whale pelvis). Fossil sequence shows change over time.
2. MOLECULES AND MAPS
- Cytochrome c, haemoglobin differences counted. Closely related species: fewer differences. Islands: unique species from few colonisers. Radiometric dating named as a clock idea, not a lab method here.
Exam Example
- Exam homologous vs analogous.
- Homologous: common ancestry
- maybe new job.
- Analogous: same job
- different ancestry.
- Bat wing and human arm: homologous.
Common Misconception
- Do not treat 1. BODY EVIDENCE and 2. MOLECULES AND MAPS as the same idea; each explains a different part of the topic.
FBISE Exam Check
- Define evidence of evolution, explain the two key parts, and use the correct biological terms.
- Exam reminder: Exam homologous vs analogous.
60-second revision
- Fossils: sequence in rocks, transitional named (Archaeopteryx if the book).
- 1. BODY EVIDENCE: Pentadactyl limb.
- 2. MOLECULES AND MAPS: Cytochrome c, haemoglobin differences counted.
- Exam reminder: Exam homologous vs analogous.
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