animal sexual selection

Question 1

why do (usually) females are more invested in the care of offspring

Answer 1

due to ANISOGAMY = the unequal gametes as eggs are expensive to produce
> “ardent” male compete for “choosy” female
> females are a scarce resource

Question 2

what does ardent mean?

Answer 2

males are enthusiastic

Question 3

which mating system has one female and multiple husbands?
A polygamy
B monogamy
C promiscuity
D polyandry
E polygynandry

Answer 3

polyandry!
e.g. the phalarope ducks
> polygamy is mutliple wifes e.g marsh harrier hawk

Question 4

why does bringing ‘nuptial gifts’ impress the females? / selectively favourable

Answer 4

proves males ability to fins food and increases their investment in mating = more commited in parental care

Question 5

is male competion
inter sexual selection
intra sexual selection
> give examples of this

Answer 5

INTRA as its between them selves
not just fighting,
> sometimes a female doesnt get a choice in a mate
> also have sperm cometition with imposter sperm or plug the female gential opening after insemination e.g. hemipteran bug

Question 6

sexual conflicts can occur

gve an example

Answer 6

infancticide - lion cubs
one parent deserting - left to raise family on own
cannabilism - female mantids eat males

Question 7

in peacocks, how are the males selected for?

Answer 7

only HIGH quality males have the advantage as clearly their display of feather REDUCES SURVIVAL
> strategic handicap

Question 8

providing nupital gifts is known as
A seperating selection
B lekking
C anthropomorphism
D courtship feeding
E supportive slection

Answer 8

OPTION D!

lekking is male-male aggressive competition