What is species? Flashcards

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1
Q

What is a the morphological species model

A

a species definition based solely on the appearance of the organism observed

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2
Q

What is sexual dismorpshim

A

differences between the appearance of the male and female of a species

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3
Q

What is the ACTUAL definition of species

A

a group of organisms with similar characteristics that interbreed to produce fertile offspring

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4
Q

what is one limitation of of the definition of “species”

A

all of the organisms in a species cannot attempt to interbreed to produce fertile offspring bc they do not live in the same area

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5
Q

what is the BETTER version of the deinftion of species

A

group of organisms with similar characteristics that area all potentially capable of breeding to produce fertile offspring

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6
Q

what is molecular phylogeny

A

the analysis of the genetic material of organism to establish their evolutionary relationships

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7
Q

what is the ecological species model

A

species definition based on the ecological niche occupied by an organism

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8
Q

What is the mate recongntion species model

A

a species based on unique fertilisation systems including mating behaviour

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9
Q

What is the gentic species model

A

species model based on DNA evidence

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10
Q

what is the evolutionary species model

A

species model based on shared evolution between groups of organisms

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11
Q

What is the limitation of the species model 1/4

A

Finding new evidence- many species have never been observed mating

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12
Q

What is the limitation of the species model 2/4

A

Plants often interbreed with different species to produce fertile hybrids

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13
Q

What is the limitation of the species model 3/4

A

many organsims do not reproduce sexually

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14
Q

What is the limitation of the species model 4/4

A

Fossil organisms cannot reproduce most have accessible DNA but they still need to be classifed

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15
Q

Why is the ecological model not that good

A

niche definitions vary and many species occupy more than one niche

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16
Q

Why is the gender recongtion model not that good

A

many species will mate with or cross poliniate other species and may produce fertile offspring but they are different species

17
Q

Why is the gentic species model not that good

A

people still have to decide how much gentic difference makes 2 organisms members of different species

18
Q

Why is the evolutionary model not that good

A

there is not always a clear evolutionary pathway for a particular organism

19
Q

Why might not two species not interbreed

A

They have different breeding time

physically incompatible gentalia