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BIOA02H3 (153)
Chapter 23

Chapter 23: Species and their Formation--KEY TERMS & DEFINITIONS

3 Pages
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Department
Biological Sciences
Course Code
BIOA02H3
Professor
Kamini Persaud

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Key Terms Chapter 23: Species and Their Formation
23.1-What are species?
The word species means kinds.
Species used to be classified based on appearance (morphological species
concept)
Speciation is the process by which one species splits into two or more daughter
species, which therefore evolve as distinct lineages
Reproductive isolation: when individuals of a population mate with one
another, but not with individuals of other populations, they constitute a distinct
group within which genes recombine.
Biological species concept: species are groups of actually or potentially
interbreeding natural populations which are reproductively isolated from other
such groups
23.2-How do new species arise?
if two populations are isolated from each other, and sufficient differences in their
genetic structure accumulate during the period of isolation, then the two populations
may no exchange genes when they come together again
Allopatric speciation: speciation that results when a population is divided by a
physical barrier (water, mountain range, etc.)
omay also result when some members of a population cross an existing barrier
and found a new, isolated population
sympatric speciation: a partition of a gene pool without physical isolation
oDisruptive selection required in which certain genotypes have high fitness on
one or the other of two different resources.
oPolyploidythe production within an individual of duplicate sets of
chromosomes
oAutopolyploidchromosome duplication in a single species
oAllopolyploidthe combing of the chromosomes of two different species
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Description
Key Terms Chapter 23: Species and Their Formation 23.1-What are species? The word species means kinds. Species used to be classified based on appearance (morphological species concept) Speciation is the process by which one species splits into two or more daughter species, which therefore evolve as distinct lineages Reproductive isolation: when individuals of a population mate with one another, but not with individuals of other populations, they constitute a distinct group within which genes recombine. Biological species concept: species are groups of actually or potentially interbreeding natural populations which are reproductively isolated from other such groups 23.2-How do new species arise? if two populations are isolated from each other, and sufficient differences in their genetic structure accumulate
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