IB Biology Topic A4.1.3 Evidence for Evolution from Selective Breeding of Domesticated Animals and Crop Plants Revision Notes (SL/HL)

IB Biology Topic A4.1.3 Evidence for Evolution from Selective Breeding of Domesticated Animals and Crop Plants Revision Notes (SL/HL) | RevisionDojo

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Selective Breeding Shows Populations Change Fast When Humans Pick the Winners

Definition

Selective breeding

Selective breeding, or artificial selection, is the process by which humans intentionally breed animals or plants to enhance specific traits.

In artificial selection, humans are the selective agent, choosing which individuals breed.
In natural selection, environmental pressures decide which individuals survive and reproduce.
Both processes shift allele frequencies across generations, which is why Darwin used breeding as evidence for evolution.

Hint

Domesticated species let us watch heritable change over years, not the millennia natural selection usually needs.

Breeders Repeat One Simple Loop Every Generation

A population already holds heritable variation from mutation and recombination.
Humans select parents that show a valued trait, such as high yield or docility.
These parents breed, and the offspring are screened for the trait.
Only offspring with the strongest expression breed again.
Over many generations the favoured alleles become fixed in the population.

Tip

The loop only works because the selected trait is heritable, so it passes to offspring.

Domesticated Animals Diverged Fast From Wild Ancestors

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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.

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Selective Breeding Shows Populations Change Fast When Humans Pick the Winners

Definition

Selective breeding

Selective breeding, or artificial selection, is the process by which humans intentionally breed animals or plants to enhance specific traits.

In artificial selection, humans are the selective agent, choosing which individuals breed.
In natural selection, environmental pressures decide which individuals survive and reproduce.
Both processes shift allele frequencies across generations, which is why Darwin used breeding as evidence for evolution.

Hint

Domesticated species let us watch heritable change over years, not the millennia natural selection usually needs.

Breeders Repeat One Simple Loop Every Generation

A population already holds heritable variation from mutation and recombination.
Humans select parents that show a valued trait, such as high yield or docility.
These parents breed, and the offspring are screened for the trait.
Only offspring with the strongest expression breed again.
Over many generations the favoured alleles become fixed in the population.

Tip

The loop only works because the selected trait is heritable, so it passes to offspring.

Domesticated Animals Diverged Fast From Wild Ancestors

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 A4.1.3: Evidence for Evolution from Selective Breeding of Domesticated Animals and Crop Plants Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Selective Breeding Shows Populations Change Fast When Humans Pick the Winners

Breeders Repeat One Simple Loop Every Generation

Domesticated Animals Diverged Fast From Wild Ancestors

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

Selective Breeding Shows Populations Change Fast When Humans Pick the Winners

Breeders Repeat One Simple Loop Every Generation

Domesticated Animals Diverged Fast From Wild Ancestors

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