BiologyChapter 14: Evolution
LAMARCK vs DARWIN
Lamarck (school): use and disuse; acquired characters inherited (giraffe neck stretched, then offspring inherit the stretch).
Learning objectives
- Explain lamarck vs darwin in clear biological language.
- Distinguish 1. lamarck problem from 2. darwin core.
- Use the key terms to answer a short Federal Board exam question.
Definition
Lamarck (school): use and disuse; acquired characters inherited (giraffe neck stretched, then offspring inherit the stretch). Rejected: gym-built muscle is not in the gametes. Darwin/Wallace: variation already exists; too many offspring; struggle; those with helpful heritable traits leave more offspring (natural selection); populations change. Modern: variation is mutation + sex; selection sorts it.
Important terms
- LAMARCK vs DARWIN
- Lamarck (school): use and disuse; acquired characters inherited (giraffe neck stretched, then offspring inherit the stretch).
- 1. LAMARCK PROBLEM
- A blacksmith's arm is not a gene change in sperm.
- 2. DARWIN CORE
- Overproduction.
Overview
Two giraffe stories:
Lamarck Problem
A blacksmith's arm is not a gene change in sperm. Weismann's cut-mice tale named if the book has it. Epigenetics is a later nuance; exams still want 'acquired not inherited' for Lamarck. Acquired traits (muscle bulk, learned skills, tattoos) affect somatic cells, not gametes. Weismann: cutting mouse tails did not produce tailless offspring. Germline vs soma distinction.
Examples Use/disuse · Need does not create a gene · Giraffe stretch rejected
Darwin Core
Overproduction. Variation. Heredity. Differential survival and reproduction. No inner drive to perfection. Extinction if change is too slow. Variation exists. More offspring born than survive. Struggle for existence. Beneficial heritable traits increase in frequency over generations. No directed 'goal' or 'need'.
Examples Finch beaks named · Struggle is competition + environment · Time is long
WHAT — LAMARCK vs DARWIN
Lamarck (school): use and disuse; acquired characters inherited (giraffe neck stretched, then offspring inherit the stretch). Rejected: gym-built muscle is not in the gametes. Darwin/Wallace: variation already exists; too many offspring; struggle; those with helpful heritable traits leave more offspring (natural selection); populations change. Modern: variation is mutation + sex; selection sorts it.
WHY — Why this topic matters
LAMARCK vs DARWIN is an independent FBISE learning unit because students must connect its structures and processes with their biological functions and examples.
HOW — How it works
LAMARCK PROBLEM: A blacksmith's arm is not a gene change in sperm. Weismann's cut-mice tale named if the book has it. Epigenetics is a later nuance; exams still want 'acquired not inherited' for Lamarck. Acquired traits (muscle bulk, learned skills, tattoos) affect somatic cells, not gametes. Weismann: cutting mouse tails did not produce tailless offspring. Germline vs soma distinction. Examples: Use/disuse; Need does not create a gene; Giraffe stretch rejected. DARWIN CORE: Overproduction. Variation. Heredity. Differential survival and reproduction. No inner drive to perfection. Extinction if change is too slow. Variation exists. More offspring born than survive. Struggle for existence. Beneficial heritable traits increase in frequency over generations. No directed 'goal' or 'need'. Examples: Finch beaks named; Struggle is competition + environment; Time is long. Exam: why Lamarck fails the gym test. Training changes the body. It does not rewrite the DNA in gametes (school). Offspring do not inherit the trained muscle.
In simple words
History of ideas. Not a social Darwinism essay.
Key points
- acquired not inherited
- selection on variation
- soma is not germline
- more born than survive
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.LAMARCK vs DARWIN
Sticky Notes · Quick Revision
Core Idea
- Lamarck (school): use and disuse; acquired characters inherited (giraffe neck stretched, then offspring inherit the stretch). Rejected: gym-built muscle is not in the gametes. Darwin/Wallace: variation already exists; too many offspring; struggle; those with helpful heritable traits leave more offspring (natural selection); populations change. Modern: variation is mutation + sex; selection sorts it.
1. LAMARCK PROBLEM
- A blacksmith's arm is not a gene change in sperm. Weismann's cut-mice tale named if the book has it. Epigenetics is a later nuance; exams still want 'acquired not inherited' for Lamarck. Acquired traits (muscle bulk, learned skills, tattoos) affect somatic cells, not gametes. Weismann: cutting mouse tails did not produce tailless offspring. Germline vs soma distinction.
2. DARWIN CORE
- Overproduction. Variation. Heredity. Differential survival and reproduction. No inner drive to perfection. Extinction if change is too slow. Variation exists. More offspring born than survive. Struggle for existence. Beneficial heritable traits increase in frequency over generations. No directed 'goal' or 'need'.
Exam Example
- Exam: why Lamarck fails the gym test.
- Training changes the body.
- It does not rewrite the DNA in gametes (school).
- Offspring do not inherit the trained muscle.
Common Misconception
- Do not treat 1. LAMARCK PROBLEM and 2. DARWIN CORE as the same idea; each explains a different part of the topic.
FBISE Exam Check
- Define lamarck vs darwin, explain the two key parts, and use the correct biological terms.
- Exam reminder: Exam: why Lamarck fails the gym test.
60-second revision
- Lamarck (school): use and disuse; acquired characters inherited (giraffe neck stretched, then offspring inherit the stretch).
- 1. LAMARCK PROBLEM: A blacksmith's arm is not a gene change in sperm.
- 2. DARWIN CORE: Overproduction.
- Exam reminder: Exam: why Lamarck fails the gym test.
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