Chapter 24 Flashcards

1
Q

Speciation

A

The process by which one species splits into two or more species

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2
Q

Microevolution

A

Changes in allele frequencies over time

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3
Q

Macroevolution

A

the broad pattern of evolution above the species level

Creates new species

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4
Q

Species definition

A

A group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring

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5
Q

Morphological species concept

A

Characterizes species by body shape and other structural features

Useful to use without knowledge of gene flow

Subjective

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6
Q

Ecological Species Concept

A

Views species within their niche

Categorizes based on interactions with biotic and abiotic components of its niche

Emphasizes natural selection filling new niches (disruptive)

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7
Q

Phylogenic Species Concept

A

Defined species as the smallest group of individuals that share a common ancestor

Hard to determine when two populations are different enough to be considered new species

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8
Q

Reproductive isolation

A

The existence of biological factors that impede members of two species from interbreeding and producing fertile offspring

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9
Q

Prezygotic barriers

A

Block fertilization from occuring

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10
Q

Postzygotic barriers

A

Contribute to reproductive isolation after a hybrid is formed

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11
Q

Habitat isolation

A

Two species may occupy different habitats in the same area and rarely encounter each other

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12
Q

Temporal isolation

A

Species are isolated by time

They breed different different times of the day or year

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13
Q

Behavorial isolation

A

Courtship rituals attract mates of the same species an d allow for species recognition

Rituals can prevent breeding with other similar types

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14
Q

Mechanical isolation

A

Mating is attempted by morphological differences prevent its successful completion

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15
Q

Gametic Isolation

A

Sperm of one species is not able to fertilize the egg of another

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16
Q

Reduced Hybrid Viability

A

Postzygotic

Genes of different parent species may interact in ways that do not allow hybrids to survive in the wild

17
Q

Hybrid Breakdown

A

First generation hybrids are viable, but by the second generation they are frail

18
Q

Hybrid defintion

A

Offspring of two separate species

19
Q

Allopatric Speciation

A

Occurs when gene flow between a population is interrupted by a barrier

Predicts that populations of the same species that are geographically isolated should accumulate genetic differences

20
Q

Sympatric Speciation

A

They are in the same area. Do not have geographic isolation

For example: yellow and orange flowers

21
Q

Autopolyploid

A

Sympatric speciation

Creates a viable polyploid offspring

22
Q

Habitat Differentiation

A

Sympatric speciation

Example: a new type of apple in an area creates a new species of flies specifically drawn to that new apple

23
Q

Hybrid zone

A

The difference between two species. Where hybrids occur

If smaller, there is a better chance for the hybrid to survive

24
Q

Reinforcement

A

Strengthening of reproductive barriers

Hybrids are not formed

Species are more and more different

25
Stability
Continued production of hybrid individuals
26
Fusion
Weakening of reproductive barriers the two species fuse together
27
Punctuated equilibrium
Describes the sudden changes seen in the fossil record followed by long periods of stasis New species are formed rapidly