Skip to main content
Ch. 24 - Speciation
Freeman - Biological Science 8th Edition
Freeman8th EditionBiological ScienceISBN: 9780138276263Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoFreeman 8th EditionCh. 24 - SpeciationProblema 2
Capitolo 24, Problema 2

Which of the following describes vicariance?
a. Small populations coalesce into one large population.
b. A population is fragmented into isolated subpopulations.
c. Individuals colonize a novel habitat.
d. Individuals disperse and found a new population.

Guida verificata passo dopo passo
1
Understand the concept of vicariance: Vicariance refers to the process by which a population is split into separate groups due to a geographical barrier, leading to isolated subpopulations.
Analyze option a: 'Small populations coalesce into one large population.' This describes the merging of populations, which is the opposite of fragmentation.
Analyze option b: 'A population is fragmented into isolated subpopulations.' This directly describes vicariance, where a geographical barrier causes the division of a population.
Analyze option c: 'Individuals colonize a novel habitat.' This describes colonization, not fragmentation due to a barrier.
Analyze option d: 'Individuals disperse and found a new population.' This describes dispersal and founding, not fragmentation due to a barrier.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
4m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Vicariance

Vicariance is a biogeographical process where a species' range is split into isolated subpopulations due to a geographical barrier, such as a mountain range or river. This fragmentation can lead to genetic divergence and speciation as the separated groups adapt to their distinct environments. It contrasts with dispersal, where organisms move across barriers to new areas.
Video consigliato:
Percorso guidato
04:25
Allopatric and Sympatric Speciation Example 1

Speciation

Speciation is the evolutionary process by which populations evolve to become distinct species. It often occurs when populations are isolated, such as through vicariance, leading to genetic differences over time. These differences can result in reproductive isolation, where the populations can no longer interbreed, solidifying their status as separate species.
Video consigliato:
02:53
Allopatric Speciation

Geographical Barriers

Geographical barriers are physical features that divide populations, such as mountains, rivers, or oceans. These barriers prevent gene flow between separated groups, leading to genetic divergence. In the context of vicariance, these barriers are crucial as they create isolated environments where populations can evolve independently.
Video consigliato:
03:35
Geographic Impact on Communities
Pratica correlata
Domanda del libro di testo

When the ranges of two different species meet, a stable 'hybrid zone' occupied by hybrid individuals may form. How is this possible?

a. Two diverged populations are capable of mating and producing viable and fertile offspring.

b. Hybrid individuals are always allopolyploid and are thus unable to mate with either of the original species.

c. Hybrid individuals may have reduced fitness and thus be strongly selected against.

d. One species has a selective advantage, so as hybridization continues, the other species will go extinct.

739
views
Domanda del libro di testo

What distinguishes a morphospecies?

a. It has distinctive characteristics, such as size, shape, or coloration.

b. It represents a distinct branch in a phylogeny of populations.

c. It is reproductively isolated from other species.

d. It is a fossil from a distinct time in Earth history.

1252
views
Domanda del libro di testo

Evaluate this statement: Gene flow increases the genetic divergence of populations.

1138
views
Domanda del libro di testo

Select True or False to indicate which of the following groups could be identified using the biological species concept.

T/F lizard species living today

T/F sunflower species living today

T/F extinct dinosaurs

T/F bacteria living today

811
views