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Bio Final > 12.1 What Is a Species > Flashcards

12.1 What Is a Species Flashcards

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Biology 101 flashcards
1
Q

What is a species?

A

A group whose members have the greatest resemblance

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2
Q

Are different species always very different looking?

A

No

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3
Q

What is a biological species?

A

A group of individuals that, in nature, can interbreed and produce fertile offspring but cannot with members of other species

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4
Q

Can different, but similar, biological species mate and have offspring?

A

No

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5
Q

What is a genealogical species?

A

defines species as smallest group of reproductively compatible individuals descended from a single common ancestor

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6
Q

What is a morphological species?

A

A group of individuals with some reliable physical characteristics that distinguish them from all other species

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7
Q

Which definition for species essentially separates different races of similar organisms?

A

?

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8
Q

Can different, but similar, genealogical species mate and have offspring?

A

Yes but it will be infertile

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9
Q

Which definition for species is most applicable to fossilized remains?

A

Morphological species

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10
Q

How do new species develop?

A
  1. Isolation of gene pools of populations
  2. Evolutionary changes in gene pools of populations
  3. Evolution of reproductive isolation between populations
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11
Q

What are 5 basic pre-fertilization barriers?

A 
Spatial
Behavioral
Mechanical
Temporal
Gamete incompatibility
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12
Q

What are two basic post-fertilization barriers?

A

Hybrid inviability

Hybrid sterility

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13
Q

What is an example of special reproductive isolation?

A

Species are separated by distance

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14
Q

What is an example of behavioral reproductive isolation?

A

Differences in mating behavior may interfere with reproduction

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15
Q

What is an example of mechanical reproductive isolation?

A

Sexual organs are incompatible

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16
Q

What is an example of temporal reproductive isolation?

A

Difference in timing of reproduction

17
Q

What is an example of gamete compatibility reproductive isolation?

A

Eggs and sperm of different species are unable to fuse

18
Q

What is hybrid inviability?

A

A zygote is unable to develop because genetic instructions are incomplete
Ex: sheep crosses with goat and produces an embryo but it does early in development

19
Q

What is hybrid infertility?

A

Product of interspecies cross unable to produce

Ex: mule

20
Q

What is a population?

A

A subgroup of species that is somewhat independent from other groups

21
Q

What is gene flow?

A

A spread on an allele throughout a species gene pool

22
Q

How can gene flow be prevented?

A

Through post and pre-fertilization

Bio Final (6 decks)

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