IB Biology Topic D3.2.6 Phenotypic Plasticity Revision Notes (SL/HL)

IB Biology Topic D3.2.6 Phenotypic Plasticity Revision Notes (SL/HL) | RevisionDojo

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Phenotypic Plasticity Changes Traits Without Changing the Genes

Organisms adjust to their environment through phenotypic plasticity, which changes traits without altering the genetic code.
The genes provide the blueprint, but the environment shapes the final outcome.

Definition

Phenotypic plasticity

Phenotypic plasticity is the ability of an organism to alter its phenotype in response to environmental changes.

Environmental Cues Switch Genes On and Off

Plasticity works by turning genes on or off in response to environmental cues.
Unlike a mutation, these changes are often temporary and reversible.
The environment influences gene expression, which controls the proteins made and the traits they shape.
Human tanning
1. Sunlight raises melanin production, darkening the skin to protect against UV rays, and it fades again when sun exposure drops.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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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 nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

Note

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.

Excepteur sint occaecat cupidatat non proident

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Tip

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 nisi ut aliquip ex ea commodo consequat.

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.

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Phenotypic Plasticity Changes Traits Without Changing the Genes

Organisms adjust to their environment through phenotypic plasticity, which changes traits without altering the genetic code.
The genes provide the blueprint, but the environment shapes the final outcome.

Definition

Phenotypic plasticity

Phenotypic plasticity is the ability of an organism to alter its phenotype in response to environmental changes.

Environmental Cues Switch Genes On and Off

Plasticity works by turning genes on or off in response to environmental cues.
Unlike a mutation, these changes are often temporary and reversible.
The environment influences gene expression, which controls the proteins made and the traits they shape.
Human tanning
1. Sunlight raises melanin production, darkening the skin to protect against UV rays, and it fades again when sun exposure drops.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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

Note

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.

Excepteur sint occaecat cupidatat non proident

Tip

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.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic D3.2.6: Phenotypic Plasticity Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Phenotypic Plasticity Changes Traits Without Changing the Genes

Environmental Cues Switch Genes On and Off

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

Phenotypic Plasticity Changes Traits Without Changing the Genes

Environmental Cues Switch Genes On and Off

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