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📘 How does a new species form?

A species is more than a set of organisms that look alike: for sexually reproducing organisms, the biological species concept asks whether populations can usually interbreed and produce fertile offspring. Speciation is a population process

5
lessons
~25 min
to learn
Adults
level
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What you’ll learn

  1. A species begins as a populationExplain why speciation begins with variation, reduced gene flow, and divergence within populations.A species forms through branching population histories rather than individual transformation.
  2. Geography can split a populationDistinguish dispersal, vicariance, allopatry, and secondary contact as geographic histories.Physical separation can reduce gene flow and create conditions for independent divergence.
  3. Barriers to reproduction buildClassify prezygotic and postzygotic barriers and connect them to gene flow.Isolation can act during habitat use, mating, fertilization, development, or fertility.
  4. Speciation can happen without a map splitDescribe sympatric, ecological, polyploid, assortative-mating, and hybrid-origin routes.Shared geography does not guarantee one gene pool when ecology or chromosomes divide reproduction.
  5. How scientists recognize a new speciesUse genetic, ecological, behavioral, geographic, and fertility evidence to evaluate speciation.Multiple lines of evidence reveal whether divergence has become persistent reproductive isolation.

Questions this course answers

What makes speciation a population process?

Speciation concerns inherited divergence and gene exchange among populations over generations.

Put the basic branching pathway in order.

Variation precedes reduced exchange, divergence, and stable reproductive barriers.

What is allopatric speciation?

Allopatric means that geographic separation helps divide the ancestral population.

Match each process to its role.

These terms describe different geographic histories and connections.

Which is a prezygotic barrier?

Different breeding seasons prevent fertilization from occurring.

Why can a mule illustrate postzygotic isolation?

Postzygotic barriers act on hybrid development, survival, or fertility.

Grounded in trusted sources

  • OpenStax, Concepts of Biology, 11.4 Speciation, https://openstax.org/books/concepts-biology/pages/11-4-speciation
  • OpenStax, Biology for AP Courses, 18.2 Formation of New Species, https://openstax.org/books/biology-ap-courses/pages/18-2-formation-of-new-species
  • Westram et al., What is reproductive isolation?, Journal of Evolutionary Biology, https://pmc.ncbi.nlm.nih.gov/articles/PMC9542822/
  • Schluter and Conte, Genetics and Ecological Speciation, NCBI Bookshelf, https://www.ncbi.nlm.nih.gov/books/NBK219728/
  • Coyne and Orr, Natural Selection in Action During Speciation, NCBI Bookshelf, https://www.ncbi.nlm.nih.gov/books/NBK219726/
  • Wikimedia Commons MediaWiki API, image metadata and thumbnails, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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