4/18 sexual selection Flashcards Preview

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Flashcards in 4/18 sexual selection Deck (30):
1

laysan albatross

mating call, both F, 1/3 of bonds are FF pairs- skwewed sex rati- low male population, parent bond storng in m and F biparental care

2

blue gills

sneaky Fers

3

hatching rate, fleding rate, overall reproductive success v. F/F pairs, M/F pairs

hatching rate better in M/F pairs no difference in fledging rate, overall reproductive success better in M/F pairs

4

cuases of same sex orientaiton/

plan B, control aggression, bonding, alternative mating strategy, brief, social aspect bonding individuals together

5

toads

M call, F choose, jump on top, egg, sperm sneaky F, any can jump on top- MM mistake/accident amplexus

6

garter snakes

in winter, form snake ball- thermoregulation, trickery

7

flour beetles

M mate with other M inseminates male, has both sperm
forcible copulation

8

bonobos

genetial rubbing, bond

9

dolphins

primarily MM older yonger dolphins
same sex copulation
blowhole sex
amazon river dolphin

10

why is homosexuality an evoltuionary problem

adaptedness: measured via reproductive success
homosexual behaior is non reproductive
homosexuality occurence FAR exceeds the baseline mutation rate of any gene
to be adaptive trait must be at least partially heritable

11

adaptive explanations for same sex sexual behavior

provides glue tat establishies, maintains and strengthens social relationships
provides conduit for intensifying/diminishing intrasexual aggression and conflict
provides younger animals with practice for courtship, mounting and other behaviorrs with reproduction to increase reproductive success when heterosexual partner becomes available

12

kin selection

taits that could arise bc they benefit individuals, reproduce through kin
traits evolve through helping related individuals reproduce
evolution of apparently altruistic traits due to enhancement of reproduction of genetically related individual - kin

13

r is

coefficient of relatednes

14

pied kingfisher

eat fish, limited nest site
year 1- help someone else reaise nestling
year 2- actually breed

15

same sex sexual orientation ranges from anywhere

mistake to on purpose
m-m

16

kin selection is

individuals engage in same sex behavior- genetic selection

17

r is

prbablity of particular gene in 2 individuals same in descent- coefficient of relatedness- how much of my genome is in another organism siblings

18

in full siblings what is r

0.5

19

in half siblings what is r

.25

20

in the pied kingfisher what is the better choice to b

priamry helper- inclusive fitness wise- best strategy on average
review this

21

inclusive fitness

overall contribution of an indiviual to gene pool of next generation is the sum of

own reproduction= direct component of fitness
enhanced reproduction of related individuals = indirect component of fitness

22

why is homosexuality an evolutionary problem

to be adaptive, trait must also be at least paritally heritable- monozygotic twins, dizygotic twins

23

F'afafine

physiologically male- orientation sex with other men, outward female characterisstics
third gender, non reproductive, occommon

24

avuncular tendendecise subscale

uncule like, related buddy- take care of teaching necies/nephews, how often do you babysit
higher in f'afafine compared to gynephlic men

25

gynephelic men

men sexually oriented toward F- hetersoexual

26

androphilic

homosexuals

27

kin selection is not the answer

little support found elsewehre

28

sexually antagonistic (against) trait

andrphilic men have higher preoductive women in life (sis, mom) vs lower in gynphelic men

look at fecudnity
same set of gene in M and F

in F boost reproductive success, increases male attraction
in M lower level expressed, usually turn off but when expressed, same sex attraction

29

fecundity

look at how many offpsring produce by related individual

30

adrophylilic men have similar sixze as women

homosexual men adn women same- biologically it is in us

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