lecture 6 Flashcards

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1
Q

what does speciation means?

A

biological, morphospecies, and phylogenetic

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2
Q

how does speciation affect biodiversity

A

increases it

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3
Q

what is the main criteria for identifying species?

A

reproductive isolation

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4
Q

what is the difference between prezygotic and postzygotic isolation?

A

pre zygotic- isolation before mating
post zygotic- not able to produce offspring that can survive

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5
Q

biological species

A

reproductive success

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6
Q

morphospecies

A

new and different species

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7
Q

phylogenetic species

A

identifies or separates species based on their evolutionary history

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8
Q

allopatry-

A

populations geographically separated

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9
Q

How does allopatric speciation differ in Dispersal
versus Vicariance?

A

the movement of organisms from one location to a new location

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10
Q

How does this differ from sympatric speciation?

A

separation despite living in same area

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11
Q

external events

A

disruptive selection

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12
Q

internal events

A

chromosomal mutations

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13
Q

Autopolyploidy

A

created when mutation leads to double chromosomes all from same species

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14
Q

polyploidy

A

have more than one set of chromosomes

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15
Q

Allopolyploidy

A

two different species mate and an error in mitosis occurs creating a viable, non sterile offspring with twice the usual chromosomes

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16
Q

What does Phylogeny actually mean?

A

evolutionary history of a group of organisms

17
Q

phylogenetic trees

A

graphical representation of this history

18
Q

what is an outgroup

A

sister group that shares a common ancestor with the taxa being studied but it is not focus of study

19
Q

ancestral traits

A

traits in common ancestor

20
Q

derived traits

A

traits not present in common ancestor

21
Q

synapomorphy

A

trait found in most recent common ancestor but not the older distant ancestors

22
Q

How do autapomorphies differ from synapomorphies?

A

autapomorphies only found in a single taxa such as humans

23
Q

monophyletic group

A

evolutionary unit that includes an ancestral population and all of its descendants but no others

24
Q

polyphyletic

A

are groups that do not include most recent ancestor

25
Q

paraphyletic

A

would be a group that include ancestor and most descendants but put all descendants

26
Q

homology

A

when traits are similar due to shared ancestry

27
Q

homoplasy

A

when traits are similar for reasons other than common ancestry

28
Q

convergent evolution

A

common cause of homoplasy

29
Q

fossil

A

any physical remains of an organism that has extinct in the past

30
Q

fossil record

A

total or complete collection of all fossils found around the world so far

31
Q

what are the 4 main limitations

A
  1. habitat bias
    2.taxonomic and tissue bias
  2. temporal bias
    4.abundance bias
32
Q

Cambrian explosion

A

went from unicellular organisms to major villa a emerged into a short period of time

33
Q

what is Cambrian explosion an example of

A

adaptive radiation

34
Q

What are 4 hypotheses that can
explain how Cambrian Explosion happened?

A
  1. higher oxygen levels
  2. evolution of prediction
  3. new niches
  4. new genes
35
Q

mass extinction

A

a wide spread event that wipes out the majority of living plants and animals

36
Q

background extinction

A

refers to the normal extinction rate

37
Q

how many big pass extinctions have there been

A

5