Chapter 21 - Phylogeny, Speciation, and Extinction

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Murchison meteorite

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15 Terms

1

Murchison meteorite

The ________ (discovered in Australia in 1969) included sugars and over 70 distinct amino acids, lending support to this notion.

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2

Inorganic materials

________ found in Earth's early atmosphere reacted to form the building blocks of living molecules.

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3

distinct species

Plants that generate extra sets of chromosomes are frequently unable to interbreed with plants that retain the original number of chromosomes, and hence evolve into a(n) ________ over time.

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4

Phylogeny

________ is the study of the evolutionary history of a species or group.

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5

Adaptive radiation

________, the development of organisms into diverse species that occupy different ecological niches, can result from speciation.

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6

sexual selection

In animals, ________ can also result in sympatric speciation.

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7

Meteorites

________ are considered to have battered early Earth.

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8

Morphological evidence

________ from fossils reveals features that are acquired or lost over time, which may be utilized to build phylogenetic trees.

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9

Human

________- caused ecological pressures, like as habitat degradation or overhunting, can raise extinction rates.

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10

Prezygotic

________ or postzygotic reproductive obstacles can induce speciation.

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11

Extinction

________ (the extinction of all individuals of a species) has occurred throughout Earth's history, as evidenced by the fossil record.

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12

Phylogenetic trees

________ and cladograms are theories regarding the evolution of organisms across time, with ________ reflecting the approximate timing of evolutionary events.

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13

Postzygotic barriers

________ exist after the zygote is produced and prevent it from maturing into a viable and fruitful adult organism.

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14

evolution of new species

The ________ is referred to as speciation.

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15

Prezygotic barriers

________ are impediments that inhibit the creation of a zygote, or fertilized egg.

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