Biol 345 Exam 3 ASU 2024/2025 Exam
Questions and Answers | 100% Solved
Speciation - 🧠ANSWER ✔✔the formation of new and distinct species in the
course of evolution.
Biological Species Concept (BSC) - 🧠ANSWER ✔✔species are groups of
actually or potentially interbreeding populations that are reproductively
isolated from other such groups
- Does not require 100% reproductive isolation
- has limitations, ie asexual reproduction
reproductive isolation - 🧠ANSWER ✔✔Separation of species or
populations so that they cannot interbreed and produce fertile offspring
sister species - 🧠ANSWER ✔✔two species descended from a single
ancestral species, and are therefore one another's closest relatives.
alloparic speciation - 🧠ANSWER ✔✔The evolution of genetic barriers
between populations that are separated by a physical, geographic barrier.
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,(speciation without gene flow) Can originate either by vicariance or
dispersal.
sympatric speciation - 🧠ANSWER ✔✔When when a single population splits
into two reproductively isolated populations while living together.
(speciation with gene flow)
Phylogenetic Species Concept (PSC) - 🧠ANSWER ✔✔an irreducible
(basal) cluster of organisms diagnosably different from other such clusters,
and within which there is a parental pattern of ancestry and descent
ecological speciation - 🧠ANSWER ✔✔the evolution of reproductive barriers
between populations by adaptation to different environments or ecological
niches
genetic conflict - 🧠ANSWER ✔✔occurs when an allele increases its own
transmission to the detriment of other alleles at the same or other loci
segregation distortion - 🧠ANSWER ✔✔unequal representation of alternate
alleles in the gametes, due to abnormalities of segregation during meiosis
Reinforcement - 🧠ANSWER ✔✔An event following a response that
strengthens the tendency to make that response.
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STATEMENT. ALL RIGHTS RESERVED
, prezygotic isolation - 🧠ANSWER ✔✔a barrier to successful breeding that
occurs before fertilization, such as differences in mating time or behavior
postzygotic isolation - 🧠ANSWER ✔✔reproductive isolation that occurs
after members of two different species have mated and produced a hybrid
offspring. Such hybrids are usually unable to reproduce
parapatric speciation - 🧠ANSWER ✔✔An intermediate between the two
other forms of speciation. neighboring populations of a single species that
exchange genes nevertheless diverge into two species. (speciation with
gene flow)
speciation with gene flow - 🧠ANSWER ✔✔sympatric speciation and
parapatric speciation involve speciation with gene flow, while allopatric
speciation does not
Vicariance - 🧠ANSWER ✔✔The physical splitting of a population into
smaller, isolated populations by a geographic barrier.
dispersal - 🧠ANSWER ✔✔the movement of organisms from one place to
another
secondary contact - 🧠ANSWER ✔✔In allopatric speciation, isolating
mechanisms evolve in geographically separated populations. They play a
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
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STATEMENT. ALL RIGHTS RESERVED
Questions and Answers | 100% Solved
Speciation - 🧠ANSWER ✔✔the formation of new and distinct species in the
course of evolution.
Biological Species Concept (BSC) - 🧠ANSWER ✔✔species are groups of
actually or potentially interbreeding populations that are reproductively
isolated from other such groups
- Does not require 100% reproductive isolation
- has limitations, ie asexual reproduction
reproductive isolation - 🧠ANSWER ✔✔Separation of species or
populations so that they cannot interbreed and produce fertile offspring
sister species - 🧠ANSWER ✔✔two species descended from a single
ancestral species, and are therefore one another's closest relatives.
alloparic speciation - 🧠ANSWER ✔✔The evolution of genetic barriers
between populations that are separated by a physical, geographic barrier.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
1
STATEMENT. ALL RIGHTS RESERVED
,(speciation without gene flow) Can originate either by vicariance or
dispersal.
sympatric speciation - 🧠ANSWER ✔✔When when a single population splits
into two reproductively isolated populations while living together.
(speciation with gene flow)
Phylogenetic Species Concept (PSC) - 🧠ANSWER ✔✔an irreducible
(basal) cluster of organisms diagnosably different from other such clusters,
and within which there is a parental pattern of ancestry and descent
ecological speciation - 🧠ANSWER ✔✔the evolution of reproductive barriers
between populations by adaptation to different environments or ecological
niches
genetic conflict - 🧠ANSWER ✔✔occurs when an allele increases its own
transmission to the detriment of other alleles at the same or other loci
segregation distortion - 🧠ANSWER ✔✔unequal representation of alternate
alleles in the gametes, due to abnormalities of segregation during meiosis
Reinforcement - 🧠ANSWER ✔✔An event following a response that
strengthens the tendency to make that response.
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
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STATEMENT. ALL RIGHTS RESERVED
, prezygotic isolation - 🧠ANSWER ✔✔a barrier to successful breeding that
occurs before fertilization, such as differences in mating time or behavior
postzygotic isolation - 🧠ANSWER ✔✔reproductive isolation that occurs
after members of two different species have mated and produced a hybrid
offspring. Such hybrids are usually unable to reproduce
parapatric speciation - 🧠ANSWER ✔✔An intermediate between the two
other forms of speciation. neighboring populations of a single species that
exchange genes nevertheless diverge into two species. (speciation with
gene flow)
speciation with gene flow - 🧠ANSWER ✔✔sympatric speciation and
parapatric speciation involve speciation with gene flow, while allopatric
speciation does not
Vicariance - 🧠ANSWER ✔✔The physical splitting of a population into
smaller, isolated populations by a geographic barrier.
dispersal - 🧠ANSWER ✔✔the movement of organisms from one place to
another
secondary contact - 🧠ANSWER ✔✔In allopatric speciation, isolating
mechanisms evolve in geographically separated populations. They play a
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
3
STATEMENT. ALL RIGHTS RESERVED
