Chapter 24 Vocabulary

Front 1

Speciation

Back 1

The orgin of new species in in evolution

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microevolution

Back 2

Evolutionary change below the species level; change in the genetic make up of a population.

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Macroevolution

Back 3

Evolutionary change above the level of species, including the aperance of makor evolutionary developments, suc as flight, that we use to define higher Taxa.

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Reproductive isolation

Back 4

The existance of biological factors (barierd) that impede members of 2 speciesfrom producing hybrids

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Biological species concept

Back 5

Definition of a species as a population or group of populations whose numbershave the potential to interbreed in natureand produce vable, fertile offspring, but are not able to produce viable, fertile offspring with members of another population

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Prezygotic barriers

Back 6

A reproductive barrier that impeads mating between diferent species or hinders fertlizatoin of ova in interspecific mating events

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reproductive isolation

Back 7

The extensive biological factors(barriers) that impede members of two species from producingviable fertile hybrids

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postzygotic Barriers

Back 8

Any of several species isolating mechanisms that prevent hybrids producing by two different species from developing in to viable, fertile adults

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Morphological species Concept

Back 9

Defining species by measurable anatomic criteria.

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Paleontological Species concept

Back 10

Definition of specied based on morphooghical differences known only from the fiossil record

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ecalogical species concept

Back 11

Defining species in terms of ecological roles (niches)

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Phylogenetic Species concept

Back 12

Define species as a set of organisms with a unique genetic histroy

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Polyploidy

Back 13

A chromosome alteration in which the organism possesses more than two complete sets of chromosomes

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autopolyploid

Back 14

an individual that has more than two chromosome sets, all derived from one single species

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allopolyploid

Back 15

A common type of polyploid species resulting from two different species interbreeding and combining their chromosomes.

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adaptive radiation

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The emergence of numerous species from a common ancestor introduced in to the environment that presents a diversity of new opportunities and challenges.

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punctured equilibrium

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In evolutionary history, lon periods of apparent stasis ( no change) interrupted by breif periods of sudden change

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allometric growth

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The variation in the relative rates of growth of various parts of the body, which help shape the organism

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paedomorphosis

Back 19

The retention in the adult organism juvenile features of its evolutionary history.

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homeotic genes

Back 20

Any of the genes that control the over all body plan of animals and plants by controlling the developmental fate of groups of cells.