3/2/2017 lecture: problem with sex II Flashcards Preview

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Flashcards in 3/2/2017 lecture: problem with sex II Deck (20):
1

conjugation in bacteria

genetic material is transfered from donor cell to reciepeint cell - tube grows donated DNA replaces same loci on chromosome of reciepient cell

2

problems in discussing evolution of sex

ecological problems, physiological problems

3

genetic represnetaiton in future generations

...

4

cost of producing males/son

sons absolutely worhtess except to produce sperm

5

cost of meiosis

cost only for sexually reproducing organisms - offspring produce sexually reproduce 2x genetic representation of sexually producing offspring; 2x payoff when reproucing asexually

6

mating promiscuity vdifference in white blood count

more sexual partners, more white blood cells in blood- you pick up more parasites

7

additional costs of sex

physiological costs, ecological costs

8

adaptive reasons for sexual reprodcution

asexual population - acceleretied rate of evolution, muller's ratchet, dna repair, repsonse to environemntal heterogeneity

9

asexual population - accelerated rate of evolution

asexual populations grow faster - fitter- as copared to sexual population - evolve slower bc it takes whole lineage in idnividual - accelerated rate of evolution

10

what is the issue with asexual population

group selection- altruistic traits evolve through group selection for "good of speiiceS" results in reproductive restraint and aid- giving behavior - adpatations/traits don't arise for purpose to help organisms - bad for population, good for individuals - VC Wynne Edwards; grow faster, adapt slower

11

muller's ratchet

mutations constatly arise can only go in one direction - mutation in one unlikely to occur in other- removal of deleterious mutations from pop - removal of deleterious mutations from pop.

12

muller's ratchet - the problem with this

mutational load doesn't go fast enough, not the entire answer

13

dna repair

repair mechanisms - like crossing over (in recombination), fix DNA, put back together, glue back, dna repair is important - otehrwise you die

14

problem with DNA repair

doesn't explain everything by self

15

response to environemtnal heterogeneity

environment changes in time , environemnt changes in space

16

environemnt changes in time is

temporal, environemnt changes

17

environemtn change in space is

spatial - dif environemtn, leave diff environemnt

18

rotifer example

homogeneous v heterogeonous environment
homogeonous- asexual
heterogeounous - sexually

19

tangled bank hypothesis

spatial heterogeneity like lottery, problem - not lot of evidence - only rotifier proves
ie - snails infect with trematodes

20

red queen hypothesis

benefit of sex is to recombat parasites and produce genetic diversity

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