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Chapter 24 Vocab (Speciation)
Speciation Vocabulary
27
Biology
12th Grade
09/21/2009

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Term
Allopatric Speciation
Definition

An evolutionary process in which one species is split up by some sort of geographical barrier so that the species can evolve differently.

Eg. One species of rabbits who once lived together are separated by a river (from a glacial melt).  The rabbits will adapt to their environments differently.

Term
Punctuated Equilibrium
Definition
The model that says a species will diverge in relatively quick bursts instead of Darwin's theory of a slow gradualism.
Term
Postzygotic Barrier
Definition

If a sperm cell from one species fertilizes an egg from another species, their offspring will usually not grow to become fertile adults.

Eg. If a donkey and a horse have offspring, their children are called mules (they can't produce ze babies!)

Term
Adaptive Radiation
Definition
Evolution of many diversely adapted species from a common ancestor.
Term
Allopolyploid
Definition
A contribution of two different species to a polyploid hybrid.
Term
Polyploidy
Definition
Mutant condition that occurs during cell division (results in an extra set of chromosomes)
Term
Autopolyploid
Definition
An individual that has more than 2 chromosome sets, all derived from a common species.
Term
Species Selection
Definition

The production of a trend within a population by natural selection.

Eg. In a population of tall and short animals, if the tall animals are more likely to survive, they set a trend for speciation.

Term
Sympatric Speciation
Definition

Speciation that takes place in geographically overlapping populations (because of chromosomal changes/mutations or nonrandom mating reduce gene flow)

Eg. A patch of green trees rise up in the middle of a forest of yellow trees with no geographical barrier

Term
Prezygotic Barrier
Definition

A reproductive barrier that stops fertilization of an egg in a different species from the sperm.

Eg... We can't have babies with dogs.

Term
Macroevolution
Definition

This encompasses a grand evolutionary change.

 

Eg. the formation of a new mammalian species

Term
Allo-
Definition
OTHER
Term
Post-
Definition
AFTER
Term
Clado-
Definition
BRANCH
Term
Paedo-
Definition
CHILD
Term
Isolating Mechanisms
Definition
Mechanisms that isolate you and give you no chance to mate with other species.
Term
Habitat Isolation
Definition

Two species can live in the same geographical area, but if they don't live in the same habitat, they can be prevented from mating.



Term
Temporal Isolation
Definition

Species may breed at different times of the day, different seasons, or different years, and this can prevent them from mating.

 

Term
Behavioral Isolation
Definition

An isolating mechanism in which two species don't mate because of differences in courtship.

 

Term
Mechanical Isolation
Definition

PARTS don't FIT :)

 

Eg. Snails will only fit in certain shells.

Term
Gametic Isolation
Definition

Gametes of different species may fail to attract one another and form a zygote.

Eg. Marine animals often discharge their eggs and sperm into the surrounding water, where fertilization takes place.

Term
Reduced Hybrid Vitality
Definition

When a zygote is formed, the fact that the 2 species are genetically incompatible may cause development to cease.  MOst of the hybrids do not complete development, and those that do are frail.

:(

Term
Reduced Fertility Hybrid
Definition

Even if 2 different species make viable offspring, reproductive isolation is still occurring if the offspring are sterile and can't reproduce.

 

Term
Hybrid Animal
Definition
If 2 different species produce a fertile offspring, that offspring may mate to produce weak offspring.
Term
Species that reproduce and form zygotes can suffer form _______ barriers to reproduction
Definition
Postzygotic
Term
Behavioral Isolation explains why _____ is important in reproduction.
Definition
Courtship
Term
Mechanical Isolation tells us that _____ potentially do not fit
Definition
Parts
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