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Evolutionary Biology > Sexual Selection > Flashcards

Sexual Selection Flashcards

0
Q

Powerful force for creating

A

Biodiversity

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1
Q

Growth limits reproduction and 1 reproductive event limits future reproductive events

A

Investment in 1 trait limits investment in another trait

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2
Q

These decrease fitness and should naturally be selected against

A

Sexual dimorphisms

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3
Q

Sexual selection used to explain

A

Antagonistic traits to natural selection

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4
Q

Anisogamy=

A

Production of different sized gametes

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5
Q

Anisogamy evolved by which mode of selection?

A

Disruptive selection

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6
Q

4 assumptions of anisogamy evolution:

A

Normal
No gametes depends on gamete size
Zygote viability depends on zygote size
Gametes released

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7
Q

2 Evolutionary Stable Strategies are dependent on whether zygote viability is strongly dependent on size:

A

Isogamy - no it isn’t

Anisogamy - yes it is

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8
Q

Batemans principle:

A

Makes mating success increases linearly with no of mates

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9
Q

Females should choose mates carefully because

A

They are the larger investor

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10
Q

Make mating success is more variable than females so

A

Variance has led to male competition

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11
Q

Intra sexual competition

A

Competition between sex with the limited access -usually males

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12
Q

Sexual size dimorphism and weapons increase success in which competition?

A

Intra sexual competition

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13
Q

Female choice influences make mating success

A

Inter sexual competition

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14
Q

Dominance/aggression: size and armaments

A

Intra sexual competition pre copulation

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15
Q

Sperm competition and infanticide are examples of

A

Intra sexual competition post copulation

16
Q

Female choice in ornaments is an example of

A

Inter sexual competition pre copulation

17
Q

Cryptic female choice is

A

Inter sexual competition post copulation

18
Q

Direct benefits of female choice =

A

Resources and parental care eg nuptial gifts

19
Q

Good genes hypothesis =

A

Trait provides reliable indication of fitness but fitness is the heritable benefit

20
Q

Sexy sons hypothesis AKA

A

Runaway selection

21
Q

Benefit to female is her sons will have the attractive trait that will attract more mates increasing her overall fitness

A

Sexy sons hypothesis

Evolutionary Biology (16 decks)

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