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From Populations To Species

When populations of the same species become geographically or reproductively isolated, they start to accumulate:
1. Genetic differences through mutation and genetic drift
2. Phenotypic differences through natural selection
Over time, these differences may result in reproductive isolation, the key step in speciation.

Note

The Gray Area in Classification

In many cases, it is difficult to decide when diverging populations have become distinct species.

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Question 1

Recap question

Two lizard groups occupy separate valleys and have not interbred for hundreds of years due to geographic isolation. Genetic analysis shows they can produce fertile offspring if crossed. According to the biological species concept, how should these groups be classified?

From Populations To Species

When populations of the same species become geographically or reproductively isolated, they start to accumulate:
1. Genetic differences through mutation and genetic drift
2. Phenotypic differences through natural selection
Over time, these differences may result in reproductive isolation, the key step in speciation.

Note

The Gray Area in Classification

In many cases, it is difficult to decide when diverging populations have become distinct species.

Unlock the rest of this chapter with a Free account

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.

Questions

Recap questions

1 of 5

Question 1

Recap question

What is the biological species concept (BSC)?

Note

Introduction to Speciation

Speciation is the process by which populations of the same species evolve into distinct species.
It occurs when populations become reproductively isolated and accumulate enough genetic differences.

DefinitionSpeciationThe evolutionary process through which one species splits into two or more distinct species.

AnalogyThink of speciation like a tree branch splitting into two separate branches. Over time, they grow in different directions, becoming more distinct.

ExampleDarwin's finches are a classic example of speciation, where different populations evolved unique beak shapes.

Speciation

A3.1.5 Difficulties distinguishing between populations and species Notes

From Populations To Species

The Gray Area in Classification

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From Populations To Species

The Gray Area in Classification

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Want a cheatsheet?

Introduction to Speciation

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

A3.1.5 Difficulties distinguishing between populations and species Notes

From Populations To Species

The Gray Area in Classification

Unlock the rest of this chapter with a Free account

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

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

From Populations To Species

The Gray Area in Classification

Unlock the rest of this chapter with a Free account

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

Want a cheatsheet?

Introduction to Speciation