BIOC54H3 Lecture : Lecture # 7

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whiteguinea-pig53

11 Apr 2011

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Lecture 7: polyandry: where one female males with many males. this occurs due to high predation rates. Post birth: some organisms are k-selected: (comes when population means near carrying capacity of the environment) a period of population growth when population sizes become stable and relatively high. The environmental conditions are fluctuating: california gull have 1 or 2 offsprings per year ( k-selected, but as parents get older, the strategies shift to more r-selected. there are mechanistic process that changes how the family care for the offspring. Investment shift trait: shift from k to r-selected is analyzed by studying the residual reproductive value, as rrv decreases, the benefit of investing in current offspring increases. Throwing good money after bad: in evolution : future decisions are based on current concept and moving forward, the amount you invested is already gone, and no longer fits into the cost-benefit analysis.

Related Questions

Suppose you are studying a species of primate. Female primates generally live in 5-km2 home ranges that overlap very little with neighboring home range territories. The primates can travel up to 5 km in one day and both males and females care for young. Which type of breeding system is most likely under these circumstances?

Select one:

a. Monogamy

b. Polyandry

c. Polygyny

d. Promiscuity

In a case where critical resources are distributed evenly in space and males provide about half of the total parental care, the mating system is most likely to be

Select one:

a. polyandry.

b. promiscuity.

c. polygyny.

d. monogamy.

Both questions form fomr the same concepts. I'm mostly confused with the promiscuity aspects such as the caring for the offspring.

I hope this can be sorted out somehow.

ochreimpala131

match the biological example (from list at the bottom) with the mating system above.

_ Dominant male elephant seals have the highest mating success

_ Male sage grouse display in large groups but don't provide females with material benefits

_male fruit flies defend oviposition sites (fruits)to mate with females upon their arrival

_ Honey bee colonies are more productive due to multiple matings by the queen

_ Female baboons will mate with lower ranked males to protect offspring from alpha male

_ Female dunnocks mate with second (beta) males to solicit paternal care

A. female defense polygny B. Resource defense polygny C. Lek D. Polyandry for material benefits E. Polyandry to reduce infanticide F. Polyandry for good genes

viridianbeetle763

The gray mouse lemur is a species in which females come into estrus and mate with several males on one night each year. Females accept any and all partners, but a genetic analysis of offspring produced by female gray mouse lemurs indicates that mothers and actual fathers differed with respect to their MHC genes to a greater degree than mothers and males selected at random from the population. Use these results to evaluate the various hypotheses on the indirect genetic benefits of polyandry. What do they suggest about the mechanism that enables a sexually promiscuous female mammal to exercise mate choice?

rosegerbil903

BIOC54H3 Lecture : Lecture # 7

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