Sexual conflict and sexual selection

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What makes up a gamete?
Sperm and egg
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What do virtually all multi-cell organisms have a difference between?
Male and female gamete
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What are sperm?
Small, unlimited and "cheap" to produce
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What are eggs?
Large, scarce and costly to produce
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What is the meeting of two dissimilar gametes called e.g. egg and sperm?
Anisogamous
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What is female gestation?
Carrying of offspring
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What is low in males?
Parental Effort (PE)
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Why are males promiscuous?
Want to maximise reproductive success
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What is inequality based on?
Inequality of mating system e.g. polygamy
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What to males mainly invest in?
Mating effort
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What does this depend on?
Quality of parental effort
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When PE and ME are equal, what is the type of species?
Monogamous
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When PE and ME are not equal, what is the type of species?
Polygamous
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When would traits solely for mating success develop?
When ME is unequal
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What is INTRAsexual selection?
Mate selection due to interactions in one sex
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What does this often lead to?
Male competition
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Those.... equipped will pass on....
Best, genes
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What does this lead to?
Tusks, antlers etc.
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What is this called?
Dimorphism
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What is an example of this?
Red deer stags
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What is an example of competition not stopping after sex?
Damselfly can remove another's sperm with its penis
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What is INTERsexual selection?
Mate selection due to interactions between sexes
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Females prefer males who can show evidence of what?
Resources
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What is an example of this?
A female hanging fly will only mate if the male can provide food
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Intersexual selection can therefore explain
Courtship displays
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What did Andersson et al find about widow birds?
Females preferred males with longer tails
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Who proposed the handicap hypothesis?
Zahavi
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What does it suggest?
That it suggests strength by surviving with handicap of long tail
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What can a long tail also suggest?
Fewer parasites and therefore "good" genes
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What did Fisher (1930) propose about what female birds prefer?
They prefer birds with better flight, associate this with long tails
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What then happens if long tails don't improve flight?
A runaway process
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Other cards in this set

Card 2

Front

What do virtually all multi-cell organisms have a difference between?

Back

Male and female gamete

Card 3

Front

What are sperm?

Back

Preview of the front of card 3

Card 4

Front

What are eggs?

Back

Preview of the front of card 4

Card 5

Front

What is the meeting of two dissimilar gametes called e.g. egg and sperm?

Back

Preview of the front of card 5
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