IB Biology Topic A4.1.1 Evolution as Change in the Heritable Characteristics of a Population Revision Notes (SL/HL)

IB Biology Topic A4.1.1 Evolution as Change in the Heritable Characteristics of a Population Revision Notes (SL/HL) | RevisionDojo

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Evolution Is a Change in a Population's Heritable Characteristics, Not a Change in Individuals

Definition

Evolution

Evolution is defined as a change in the heritable characteristics of a population over time.

Evolution is a change in the heritable characteristics of a population over generations.
Populations evolve, but individual organisms do not: an individual keeps the alleles it was born with for life.
What changes over time is the allele frequency within the population.

Hint

An individual cannot evolve during its lifetime.
A population can change across generations as allele frequencies shift.

Only Heritable Variation Can Drive Evolution

Heritable characteristics are encoded in DNA and passed from parent to offspring through gametes.
1. Example: darker fur colour in a mouse caused by a genetic mutation.
Acquired characteristics develop during an organism's lifetime through use, environment, or learning.
1. Example: a tennis player builds stronger bones and muscle in their dominant arm.
Only heritable variation can drive evolution, because only DNA passes to the next generation.

Common Mistake

Acquired characteristics cannot be passed to offspring.
A trait built by exercise or environment leaves the gametes unchanged.

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Note

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Tip

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

IB Biology Topic A4.1.1: Evolution as Change in the Heritable Characteristics of a Population Notes

Evolution Is a Change in a Population's Heritable Characteristics, Not a Change in Individuals

Only Heritable Variation Can Drive Evolution

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Evolution Is a Change in a Population's Heritable Characteristics, Not a Change in Individuals

Only Heritable Variation Can Drive Evolution

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Duis aute irure dolor in reprehenderit

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A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic A4.1.1: Evolution as Change in the Heritable Characteristics of a Population Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Evolution Is a Change in a Population's Heritable Characteristics, Not a Change in Individuals

Only Heritable Variation Can Drive Evolution

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

Evolution Is a Change in a Population's Heritable Characteristics, Not a Change in Individuals

Only Heritable Variation Can Drive Evolution

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account